Malicious PDF — malware analysis report

Static analysis result for SHA-256 1878fe608a98ee64…

MALICIOUS

PDF

93.4 KB Created: 2021-04-16 05:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eff6194869da2cb5fa89bedd63e7c88d SHA-1: 9b991bfa265283db31c76d01bf98c4f9c3988f05 SHA-256: 1878fe608a98ee64a2a2c73fa79907184ee3a2c42b6c4f73d19871620781d204
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dafemum.ru/strik?utm_term=huffy+cruiser+seat+post+size PDF link annotation
    • https://tavebesu.weebly.com/uploads/1/3/1/3/131381332/ruvanodepebetiz-nabelodaxulul-jigigez.pdfIn PDF document text
    • http://ubsvp.com/266602018337e42m.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/65516249922.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/20394948265.pdfIn PDF document text
    • http://geleostone.online/2035451133tskr9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482407/normal_5fdac87c32347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449774/normal_60325f587eee2.pdfIn PDF document text
    • http://zamowafa.mywebcommunity.org/libros_para_aprender_espaol_a1.pdfIn PDF document text
    • https://tezugigawezen.weebly.com/uploads/1/3/4/8/134878192/9263540.pdfIn PDF document text
    • https://fibexijenoka.weebly.com/uploads/1/3/2/6/132680926/vovevanos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502500/normal_602961b7b36a2.pdfIn PDF document text
    • http://ridunculus.com/luriwaxinizamitibowa2tvxk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_6061ad55e6c3d.pdfIn PDF document text
    • https://mipapipav.weebly.com/uploads/1/3/4/0/134012398/gufewuduv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b0e508-97d2-490a-9d6c-754473a3dce0/32361951979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d45911fe-7176-430d-8e7b-cad6c54fcc64/gagetipinesodenusokuzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3548cc9-7dcc-4731-9150-eae81269ad9c/america_the_essential_learning_edition_combined_volume_chapters_1_to_30.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a979e042-0d31-4088-bea5-043f924d2fdf/watch_the_hunger_games_catching_fire_stream_free.pdfIn PDF document text
    • http://malejubu.myartsonline.com/8890541437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6b7c11a-cc75-4312-9b0d-7a1f169afd5b/xivejinifoperuzeluni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f18764a-90c8-45ab-b7a0-387d47ccc7c1/mesipinon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac06df1-b201-4729-878c-79aea517d5f3/are_old_swatch_watches_worth_anything.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa97584-192d-4734-a371-8a86ae043d01/72735675137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6c5ef18-110a-45c4-8c38-33f14ac23789/azar_grammar_series.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_off00013179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13179 5092 bytes
SHA-256: b602f39d7def10d030bc8abcdd4fa72d788cc98db569d16dc536c97bd3abc0ef
font_01_sfnt_off000142f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F0 11044 bytes
SHA-256: 42356b6eb9257581991b38c63bbfc5db923f9d51b6398d06bdb97c5e745bf065