Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af012bc24af4cbd…

MALICIOUS

PDF

76.9 KB Created: 2021-03-31 20:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 331ee469a774eae0e0d6a087d86120df SHA-1: 76bd7f60725a25f423a157d529b691083493e031 SHA-256: 7af012bc24af4cbd7a79c521f6feba58aba1b7012f231221cc6fe4554c18f011
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 0.9993

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://zajinet.ru/wix?keyword=unicast+ranging+received+abort+response PDF link annotation
    • https://cdn.sqhk.co/gepaxulunan/gjkjbPg/school_counseling_techniques.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/the_vampire_diaries_quotes0g3oa.pdfIn PDF document text
    • https://cdn.sqhk.co/bumajanivosi/kjbieH4/bolulizedex.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/jagjhbs/stack_ball_2020.pdfIn PDF document text
    • http://gukivuzijisuva.getenjoyment.net/47677449850.pdfIn PDF document text
    • http://thrivewebs.com/fozazrsvxv.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/38377226238.pdfIn PDF document text
    • http://onsideball.info/gladiator_theme_sheet_musicyc303.pdfIn PDF document text
    • http://japamawosoj.mygamesonline.org/94393670737.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/azrNsje/history_and_history_of_education.pdfIn PDF document text
    • https://cdn.sqhk.co/nudadubuju/hdjbgid/marxism_examples_in_literature.pdfIn PDF document text
    • http://my-favshopd.online/swedish_flag_emoji_androide6okb.pdfIn PDF document text
    • http://voztrans.ru/baby_girl_christmas_dressvyqnl.pdfIn PDF document text
    • http://milanbeachs.space/tudufivotepuwxg17w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_d8640b59193840d7aeb1ac12fe0b960b.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_ae9cda52bc8f41c18a733f5e81880ca5.pdf?index=trueIn PDF document text
    • http://nipufafinera.epizy.com/tobifiv.pdfIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_6fd0c676a97547cabb41f39df413e6dd.pdf?index=trueIn PDF document text
    • http://kegaregajisojas.rf.gd/totivupe.pdfIn PDF document text
    • http://fuluxewamotate.atwebpages.com/edital_prf_2020_baixar.pdfIn PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_c67bf15b7feb48688643f114146f4f07.pdf?index=trueIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_22967271030340c2b5cef09ce2871342.pdf?index=trueIn PDF document text
    • http://fujesotes.epizy.com/how_many_trials_of_apollo_books_are_there.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_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 5400 bytes
SHA-256: 08655d0f2e5fb950a8f2e970fd63e9fba164eed9a748ee527878f0ceb31bce13
font_01_sfnt_off000102e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 10432 bytes
SHA-256: 08308ffede19997c3e179bb07bb7c3ab3071d56f446ce8bacb5cd9c7fd158a7d

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