Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8a960bf7f7ac93…

MALICIOUS

PDF

78.8 KB Created: 2021-05-26 11:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c47f19147857c876e0df24a0bcfbe103 SHA-1: 85b5ff1316d5f83742850e52a38a1bc1c9df1896 SHA-256: 2a8a960bf7f7ac93b9c4808c1bba5439a8fba5d1d8f4ef2be3989ff4c4a97063
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO spamming technique. The primary URL, 'https://resalured.ru/strik?utm_term=integrated+math+1+volume+2+answers+pdf', is presented as a search result, likely to trick users into downloading malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly indicate malicious intent, possibly for phishing or malware distribution.

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://resalured.ru/strik?utm_term=integrated+math+1+volume+2+answers+pdf
    • https://cdn-cms.f-static.net/uploads/4443326/normal_5fe8ffd06bf92.pdf
    • https://cdn-cms.f-static.net/uploads/4485012/normal_6035d8c29a30d.pdf
    • https://cdn-cms.f-static.net/uploads/4459319/normal_6038d402d5015.pdf
    • https://cdn-cms.f-static.net/uploads/4379602/normal_5fdbb4a9f3660.pdf
    • https://fenogelojana.weebly.com/uploads/1/3/4/9/134904444/2928815.pdf
    • https://lejuziluzamof.weebly.com/uploads/1/3/4/8/134863123/zitajojenul_xuweda.pdf
    • https://sapemeke.weebly.com/uploads/1/3/2/8/132814969/guritulufe.pdf
    • https://cdn-cms.f-static.net/uploads/4406464/normal_606c7def027eb.pdf
    • https://podesasi.weebly.com/uploads/1/3/1/4/131437149/fodado_jogidurapijimaz_woril.pdf
    • https://cdn-cms.f-static.net/uploads/4427295/normal_60412b4f5f3dd.pdf
    • https://jerupixudenaxi.weebly.com/uploads/1/3/1/4/131437293/vogowepabewoxid_vudisaloguf_futidotoke_vopuriw.pdf
    • https://cdn-cms.f-static.net/uploads/4379474/normal_5fd2bfaabc36a.pdf
    • https://cdn-cms.f-static.net/uploads/4453575/normal_60622988224a3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vuxirefare/52610045080.pdf
    • https://s3.amazonaws.com/ravuxudibure/35455898.pdf
    • https://uploads.strikinglycdn.com/files/8c5a303f-ef47-416f-9a51-437b93607bdf/fuwolifuxuzigoz.pdf
    • https://uploads.strikinglycdn.com/files/b1ccb8db-223b-4219-b75e-ec1bee641569/busom.pdf
    • https://s3.amazonaws.com/jasadavebaga/18966720337.pdf
    • https://s3.amazonaws.com/laginekux/vowojimivobikawupanevesoj.pdf
    • https://s3.amazonaws.com/bejikefowu/cell_phone_tracker_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e203.bin
abeacf5c588aac80dae5fa165144808c20a60390707eba94ec891578aa9125c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 3876 bytes
font_01_sfnt_off0000efd1.bin
0fd9bfb5a6bd5211b7b17c9e775cfd9ad1dff3e67b1f05fa1d16b81e4fa38a9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 5728 bytes
font_02_sfnt_off00010348.bin
d948c9c9decf9295c7ae7c8cdb9437c0df271ea4c02747ef76b80f3b73d23189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 12280 bytes

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