Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3c288de69526c8…

MALICIOUS

PDF

70.6 KB Created: 2021-03-14 00:03:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed12698f8ccafac24e123b84243a949b SHA-1: 1d2e2d97de964d5f7d0c6fc3d53c5e9f6777eb05 SHA-256: 8a3c288de69526c8c242003d82e9a3ce5a6c3ffb1d4324a7cb1706d7ce15f13f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning or phishing campaigns. The heuristic PDF_SEO_LINK_FARM specifically indicates a mass of external PDF links, suggesting an attempt to drive traffic to malicious or low-quality content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/wix?keyword=numerical+expression+worksheets+5th+grade+pdf
    • http://hotel-engels.ru/bilewiko9ely.pdf
    • http://wurilozi.scienceontheweb.net/best_pimp_rappers.pdf
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/ziwij.pdf
    • https://pobanebutu.weebly.com/uploads/1/3/4/5/134592169/2a2df10c3d7bb.pdf
    • http://kurametugugu.mygamesonline.org/back_exercises_arthritis_uk.pdf
    • http://raisinshq.pro/xurakifawawutc2xmt.pdf
    • https://toxosujaduwo.weebly.com/uploads/1/3/0/8/130874389/durid.pdf
    • http://ruvujagefeko.mygamesonline.org/nimuzusiretawolotizozag.pdf
    • http://save50it.info/livawozimodorixogolixozuk235e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_28f2e7becc0e412aba635c1c1243ecfe.pdf?index=true
    • https://s3.amazonaws.com/gotenukevepunin/why_my_hyundai_sonata_wont_start.pdf
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_3ef85f81405a44e1a9e9dd89065feb87.pdf?index=true
    • http://pasigajixivete.epizy.com/are_skinny_vanilla_lattes_bad_for_you.pdf
    • https://s3.amazonaws.com/lepefi/54199634802.pdf
    • http://ranitirunom.myartsonline.com/principles_of_electric_circuits_10th_edition_answer_key.pdf
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_e4abef53511a4a538627898580f8d9c9.pdf?index=true
    • http://gejuzimeru.rf.gd/zajikewavererib.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_off0000d3ce.bin
a6ae5eeb6035bdb574f742ee1bc3db5d2a6e1c13306184ed5ffec54cd878e22d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CE 5884 bytes
font_01_sfnt_off0000e7d0.bin
00be4fad9cac5d03c5fc5074e0da0c8e27c38db09b1b21326e1f33f9c6b9b7fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 10972 bytes