Malicious PDF — malware analysis report

Static analysis result for SHA-256 f512faf6d8273315…

MALICIOUS

PDF

94.7 KB Created: 2021-03-19 23:56:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 157aa466d477acfc80a1e7e22a7e672b SHA-1: 25f45570d62e6ee878c01cf1f115cf88121056f7 SHA-256: f512faf6d8273315dd5bc53e0230853af1fcae10ba2d56b22a450858df80a223
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to create a link farm for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=the+power+broker+audiobook+free
    • https://rojuligu.weebly.com/uploads/1/3/0/9/130969709/sitodawobejoz_lisusugu_vutimerav_tikub.pdf
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/d4bbb.pdf
    • http://zapixexarepol.medianewsonline.com/risifipobukowem.pdf
    • http://expressvpn.store/ritufigasosamopec6v8w.pdf
    • http://fullstacket.online/how_to_round_off_nearest_hundred_in_excel57enu.pdf
    • https://cdn-cms.f-static.net/uploads/4387699/normal_603bb96abcd27.pdf
    • https://xogefuvoza.weebly.com/uploads/1/3/2/3/132303221/9356918.pdf
    • https://vefoduwuwi.weebly.com/uploads/1/3/4/9/134902927/tubuwuxofobofuzefisu.pdf
    • http://riniwodifole.medianewsonline.com/cuales_signos_se_atraen.pdf
    • https://cdn-cms.f-static.net/uploads/4465263/normal_6036e0be1b840.pdf
    • https://static.s123-cdn-static.com/uploads/4456998/normal_5ff1670733b1f.pdf
    • http://kuvenumine.mygamesonline.org/92504469008.pdf
    • https://sutisivanopazar.weebly.com/uploads/1/3/4/3/134310164/lojemofepe-zofibi-femukufapemugis-vunenoxovuj.pdf
    • http://googsnat.space/631649824326mw11.pdf
    • http://uspeh.icu/which_fictional_character_am_i_buzzfeedyyo3b.pdf
    • https://cdn-cms.f-static.net/uploads/4420752/normal_600b34e7d9c44.pdf
    • https://cdn-cms.f-static.net/uploads/4477649/normal_6035a5b45a69e.pdf
    • http://koreanluxe.com/24452817072vsrdi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kavezusi.onlinewebshop.net/xobepeb.pdf
    • https://60883313-e483-4213-bdf2-3844198a3b35.filesusr.com/ugd/3ba96b_d2e90cba73f34ee6ba31e45d6a3810d2.pdf?index=true
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_8c4bdda980f84747bfe10e402f6188c1.pdf?index=true
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_7d203e6a59e6453f88b3d13b8b554987.pdf?index=true
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_e4694df4c8674da599dd419397bcec8a.pdf?index=true
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_fb5d53d929fa48c5b78ddeac0ed3395b.pdf?index=true
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_d5726c083fdc4cde992284fa7562ed64.pdf?index=true
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_3b251a914bfb4d5c90569f1370d24e15.pdf?index=true
    • https://efec373b-cb85-4617-95c0-ca1809d574ea.filesusr.com/ugd/9529b1_255ea6b9a39b459d961f1bc1affad28e.pdf?index=true
    • 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_off00013398.bin
44dda878b4bb30e2bb47e3ec1c3312d5df22034b96ffa9876a500aa6b1422084		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13398 5164 bytes
font_01_sfnt_off00014531.bin
3b31f02c4f07e2ccbfbb948b0897df5b56cc46edb4e3e16be1becd60f08a5d39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14531 11684 bytes

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