Malicious PDF — malware analysis report

Static analysis result for SHA-256 abfa66d2e424f110…

MALICIOUS

PDF

79.7 KB Created: 2021-04-14 21:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5fc354f46ca7e6aad3bab77a971ef1bc SHA-1: 7d56c607f8b44854eaf97bf1ae4993e6b85a0fe0 SHA-256: abfa66d2e424f110a0b232e49122d472dff161fc4d320715625fe0078a1554e7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs, such as 'https://leonvi.ru/strik?utm_term=polaroid+onestep+sx-70+manual', are likely used to redirect users to malicious sites. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/strik?utm_term=polaroid+onestep+sx-70+manual PDF link annotation
    • http://sivelural.mygamesonline.org/63176505928.pdfIn PDF document text
    • http://solusaxisabo.scienceontheweb.net/jumperoo_fisher_price_rainforest.pdfIn PDF document text
    • https://dubitofux.weebly.com/uploads/1/3/4/4/134458445/2835121.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/rugizagiwopali-rebavol-pufevarokus.pdfIn PDF document text
    • https://bomigisojibovo.weebly.com/uploads/1/3/0/9/130969974/3305708.pdfIn PDF document text
    • http://tadajixilatu.scienceontheweb.net/86672830291.pdfIn PDF document text
    • http://fuvidevifa.scienceontheweb.net/handbook_of_operational_amplifier_applications.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec75ba9f-29a7-4b73-bb51-4c951d20089f.filesusr.com/ugd/17cde0_f0430891777e41bf891efaa51cceeecb.pdf?index=trueIn PDF document text
    • https://9a2ac3f7-8316-4342-9d28-a75bb8d545bf.filesusr.com/ugd/599026_a6c637e03206456287aa6c54223f6ddc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/zozuzavokarurisupi.pdfIn PDF document text
    • https://7704dd35-2db2-4ca2-aa08-348d3b961acd.filesusr.com/ugd/84a5c6_e8e9c893cd1f46b398887acb5b1076a6.pdf?index=trueIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_01ffd92aca434228907722a28f7b6bce.pdf?index=trueIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_2b02547687f34b37867097986bff57c6.pdf?index=trueIn PDF document text
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_9c5b8d41e43d42d5b78b6cb2fc729793.pdf?index=trueIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_a29be91ea29942268d7b859c005f1eb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/bangla_oporadhi_song_3gp.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/hazard_identification_card_template.pdfIn PDF document text
    • https://e474413f-ff6d-4b46-a00c-d4c33541206b.filesusr.com/ugd/ddecc0_a5219ca4251349c0a277972301bc2e08.pdf?index=trueIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_d1e64ef5c3ab44a8b7306b104aa083f7.pdf?index=trueIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_9d514a3b0df64f58b44a18cd55c107ca.pdf?index=trueIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_2f2f00aab6624d97af8f3e1c4ef509e5.pdf?index=trueIn PDF document text
    • http://tuxefunuzire.atwebpages.com/basic_arrhythmias_gail_walraven.pdfIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_023bde9c150d4bb197bffdd752a11e96.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_22e095722168408ea375457511324fd4.pdf?index=trueIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_f898f52cb3f44dd0b65e52b5086d8241.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 5428 bytes
SHA-256: 3d7c7b258b8d2d2fc1d171ad75becc8f9f3695f7ea0ac3aa4d6a06ba6d55c40f
font_01_sfnt_off00010b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 11016 bytes
SHA-256: c7053c6ad395e74fb0fe45f7d00cc8393de62f1ce29c2a029f2d1be447db83f5

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