Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a0719680694ae1…

MALICIOUS

PDF

79.9 KB Created: 2021-03-28 20:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: eebbff8f3e14c0dd577887fb8e7854d8 SHA-1: e2321b949ddbbec8d935f5fdcd7e577de604734d SHA-256: 35a0719680694ae19abf3a3a0f836fc9366812e5648b2083ac9ffccaeda857f1
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a large number of links hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=computer+networking+full+tutorial+pdf PDF link annotation
    • https://tudimase.weebly.com/uploads/1/3/5/9/135985307/1812698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415327/normal_600c702f2ca71.pdfIn PDF document text
    • http://fakaripeti.xyz/stock_market_live_ticker_todayhtce8.pdfIn PDF document text
    • https://rolowuwojudazap.weebly.com/uploads/1/3/5/3/135302881/vofidotegova-wobejuximutati-lotobozene-puvufoped.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373248/normal_5fccd8b57daa5.pdfIn PDF document text
    • https://pabedowilopore.weebly.com/uploads/1/3/1/1/131163579/8707081.pdfIn PDF document text
    • https://fuwelobuzade.weebly.com/uploads/1/3/4/6/134649994/wigabemixevetix-tinujunegojur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408718/normal_6041bc9fe4831.pdfIn PDF document text
    • http://teaapple.space/vajozude2spy.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/maze_runner_trilogy_4k_blu_ray.pdfIn PDF document text
    • https://luxufaxunixepu.weebly.com/uploads/1/3/4/5/134584211/nagimenasafasun.pdfIn PDF document text
    • http://importants.space/7046895454q06bs.pdfIn PDF document text
    • https://lubavezutumeji.weebly.com/uploads/1/3/4/7/134757539/xubudobuvi.pdfIn PDF document text
    • https://vofitikasu.weebly.com/uploads/1/3/1/8/131871658/9a7cb.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/selasiduzu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382953/normal_5fed64fdbc961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459623/normal_604fd83c011b4.pdfIn PDF document text
    • https://vorevowupi.weebly.com/uploads/1/3/4/6/134633589/4a4ede4dbef563.pdfIn PDF document text
    • https://mobajexiv.weebly.com/uploads/1/3/4/4/134455683/d55b21b927.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/60837859150045e4.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/48317088966.pdfIn PDF document text
    • https://juxapokidopelif.weebly.com/uploads/1/3/1/6/131606881/korelewaz-gupupizebuwug-kudekuxitazelur.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/959668314261sz9h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_720214634e5e407a8536b3b0822ce41b.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_13f8623705164cc0ba929e59a08b4a5a.pdf?index=trueIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_ce424646678748cfb541ab75542c44b6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 5244 bytes
SHA-256: ee2d87cd3b815d16bb0b30fe34b376718c1f1fb6a47ccb69e2a40b53924dc851
font_01_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 10272 bytes
SHA-256: 6acaabd2a2105717fb23912cf7c1d878d481a825f6d9b9de2c2491cb0c30f264
font_02_sfnt_off000123a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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