Malicious PDF — malware analysis report

Static analysis result for SHA-256 7194c75d886394f6…

MALICIOUS

PDF

73.5 KB Created: 2021-03-24 08:58:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84d5cb058f708e07a78f0b7ff1269c32 SHA-1: b59c00845dba13e462244506156aeb1fb7c350fb SHA-256: 7194c75d886394f66849ebc06c19c53f25b78803c03e891316e292e6277bfb96
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or phishing campaign designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/strik?utm_term=osmosis+worksheet+answers
    • https://ziwegakesamud.weebly.com/uploads/1/3/4/4/134468237/6204b5.pdf
    • https://static.s123-cdn-static.com/uploads/4367617/normal_5fcbcd1599893.pdf
    • https://cdn-cms.f-static.net/uploads/4401555/normal_5fd3398372305.pdf
    • https://cdn-cms.f-static.net/uploads/4495246/normal_5fdbe4f6d7540.pdf
    • https://jetorijeroxu.weebly.com/uploads/1/3/4/6/134693882/xewenakikadiw.pdf
    • http://sevibifodome.getenjoyment.net/behaviorismo_na_educao.pdf
    • https://cdn-cms.f-static.net/uploads/4470211/normal_60173fdb23770.pdf
    • https://cdn-cms.f-static.net/uploads/4455658/normal_601a8896c100b.pdf
    • https://cdn-cms.f-static.net/uploads/4453553/normal_5fd31130d25e9.pdf
    • https://cdn-cms.f-static.net/uploads/4480584/normal_6036f938bd539.pdf
    • https://cdn-cms.f-static.net/uploads/4488556/normal_603e8ccc17bd8.pdf
    • http://gazagidumow.mygamesonline.org/logic_pro_10.1_system_requirements.pdf
    • https://dudixugodibemuf.weebly.com/uploads/1/3/1/4/131406925/vebubuzozatelu-xaromuposugisez-zulabopabosum-nuwisanufupe.pdf
    • https://mewejubakokexal.weebly.com/uploads/1/3/2/6/132681976/wefiper.pdf
    • https://sakuvajavabese.weebly.com/uploads/1/3/1/3/131383602/e975025bc79b9.pdf
    • https://cdn-cms.f-static.net/uploads/4381788/normal_601f1be71594f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/26921e68-2384-4d7e-8978-e82fc021ffa6/93432191821.pdf
    • https://s3.amazonaws.com/nitatotol/whatsapp_plus_2018_version.pdf
    • https://uploads.strikinglycdn.com/files/68f2509e-3148-4397-8150-258c6f676995/18782006846.pdf
    • https://s3.amazonaws.com/nuxomigo/najajajodugedotifoguboka.pdf
    • http://kijonag.onlinewebshop.net/how_much_is_a_stihl_ms_170_chainsaw.pdf
    • http://totuxivez.onlinewebshop.net/does_roomba_960_have_smart_mapping.pdf
    • https://uploads.strikinglycdn.com/files/3ce13d44-1245-47fd-be1f-c04a1a194e86/zinapafew.pdf
    • https://uploads.strikinglycdn.com/files/56439b87-68af-4e18-af82-61e33797cd39/66594401184.pdf
    • http://gumomexad.onlinewebshop.net/vekejaro.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e42c.bin
999862546c6861edbd3e38373c55b85108788763d59a67ac10e5b8b650356e97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 5076 bytes
font_01_sfnt_off0000f553.bin
edf2aab4b718225347c593c62ae7d5098950945c1434cc029653ea4a74946c11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 10628 bytes

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