Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd797b65ab479aff…

MALICIOUS

PDF

78.2 KB Created: 2021-03-30 15:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: de0c9dbcb9a507941cc82e0d0522a6fa SHA-1: 08b266164db0c1ed011165dc1fd97ada9dbb47cb SHA-256: fd797b65ab479affef1f518903727098a415c425f5da22b51cc4e64928f0424c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam tactic to distribute malicious content. The document body, though heavily obfuscated, appears to be a lure for a manual, likely to trick users into clicking the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://xezojetit.ru/wix?keyword=spacemaker+xl1800+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5fe64ee937dd5.pdfIn PDF document text
    • https://dozolujikofirig.weebly.com/uploads/1/3/1/8/131856703/86412.pdfIn PDF document text
    • https://zolotamazuragif.weebly.com/uploads/1/3/2/7/132712333/6984724.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387718/normal_601a3582e9675.pdfIn PDF document text
    • https://penomagara.weebly.com/uploads/1/3/2/6/132695387/sasivofivemun-vojefo.pdfIn PDF document text
    • https://pewituzusab.weebly.com/uploads/1/3/0/8/130874049/lixobomuxo.pdfIn PDF document text
    • https://sakiverore.weebly.com/uploads/1/3/6/0/136095660/kuwevubada.pdfIn PDF document text
    • http://ru-dev.xyz/xeroborezigewuwaw5m965.pdfIn PDF document text
    • http://sollabs.xyz/22692784836ovuya.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478655/normal_60160d08205d9.pdfIn PDF document text
    • https://takigufumugo.weebly.com/uploads/1/3/5/3/135345847/famerigunikof-kusilanipuveji-saker.pdfIn PDF document text
    • https://gudesikoz.weebly.com/uploads/1/3/4/3/134374550/muzel_xarav_fubet.pdfIn PDF document text
    • http://azalea.store/gotodugaxemexalpgmp5.pdfIn PDF document text
    • https://mewerenazedesaf.weebly.com/uploads/1/3/4/8/134885553/mupebatero_vodurotafij.pdfIn PDF document text
    • http://masalev.ru/firulodemhkpc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459164/normal_5fee195c2f2e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_1c2427e020fd45dc9ed5d7f5b7970a13.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/84982332407.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_9b28451efdd94b45b8b0d6ca8ea99da5.pdf?index=trueIn PDF document text
    • https://b0837e58-6fb0-4b2c-a83d-c451c4d85cc2.filesusr.com/ugd/1169b1_3634ee48a541490fb708ef4a40b4af75.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/television_vocabulary_worksheet.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_086e5f4ce0c143939dc50075863a2863.pdf?index=trueIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_c4e3a05fdc4b4cd99b96fa7a6cfbe6ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setigafat/social_values_in_education_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/integer_word_problems_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/nujowok.pdfIn 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_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 5524 bytes
SHA-256: 8e32e20625b50ec002a8ba7615dd57ddbbf74c1153c3b48183d10d739cc7ff28
font_01_sfnt_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 11688 bytes
SHA-256: 95e851047a028ebbb7fd48dec40aaf1e457192ceda41246a2e0d090c40c351aa

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