Malicious PDF — malware analysis report

Static analysis result for SHA-256 6874be0ce8d2e0b7…

MALICIOUS

PDF

77.4 KB Created: 2021-04-02 01:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: dc0d000ed2ab8621820f4eebfc74d8ce SHA-1: a61d6a31cd31dc683821905560799e854a3f6a0d SHA-256: 6874be0ce8d2e0b762917f1f52b21cf417e22c29a362edcf688d24acee97ecd0
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The primary malicious URL identified is https://midufefew.ru/award, which appears to be part of a SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/award?keyword=8th+grade+algebra+1+worksheets+pdf PDF link annotation
    • https://bituxomixa.weebly.com/uploads/1/3/4/1/134131270/baxepoleturutal_tibezidibu.pdfIn PDF document text
    • https://fapusazi.weebly.com/uploads/1/3/4/8/134849501/e1609c3a33c91.pdfIn PDF document text
    • https://rupasofo.weebly.com/uploads/1/3/4/8/134892789/9508877.pdfIn PDF document text
    • https://mubuxepuvu.weebly.com/uploads/1/3/1/3/131383429/demokogawizu_wefalanomuref_jetulir.pdfIn PDF document text
    • https://webolubodu.weebly.com/uploads/1/3/0/9/130969971/4494836.pdfIn PDF document text
    • https://xoduwotef.weebly.com/uploads/1/3/5/3/135328954/fejegulusuxomok_nomomada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2eb1f2bb-56af-4097-abd0-b632352b14bf/compare_slingbox_m1_and_m2.pdfIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_8753e87cb8fd41dfa4685574661f59ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2a1101-38b2-4504-a9d0-90d3f0e47adc/32664290234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af382973-c8a8-4ef1-a367-e95914da3854/el_dador_de_sueos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f03dc74e-39d3-49e0-906d-05fb6497eaee/kinodif.pdfIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_5243b90b31da4999b016066942a4d037.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cc33874-f085-4bc9-9964-a65d98e4e631/rulixaxapigilulanan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6cc9e17-1d8b-4ab2-a0fe-f2a6d1c3737e/4934576774.pdfIn PDF document text
    • http://verejixufitoge.rf.gd/barbie_doll_clothes_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4859fc5-a722-49a3-aa78-2ed0dcd43b45/44048511618.pdfIn PDF document text
    • http://gobonelore.epizy.com/75411596411.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 5384 bytes
SHA-256: cbc78c06d8a4cfa85a2b14a2d671743ad91f1cc6210637431b05232505fd3676
font_01_sfnt_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 10620 bytes
SHA-256: 0db33b94c652c2a2ab35a4e9d7faa723bab8feae4ddf66648bf925c7537bf643
font_02_sfnt_off00011a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A74 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

Open this report in the interactive analyzer, or submit your own file for analysis.