Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b80e41d9af7d38d…

MALICIOUS

PDF

72.9 KB Created: 2021-03-04 07:49:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bb468dea0e082a251a9a791b825c0025 SHA-1: 26ba30c0730c6066cde0166bff7a7d7a358ac32d SHA-256: 2b80e41d9af7d38d0b48c4043fa90b8833d073a7ced88ce79518ba7a0c938fcf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, forming a link farm, with one prominent URL pointing to a potential phishing or malware distribution site. The presence of 'powershell_commands_cheat_sheet.pdf' in the document text suggests an attempt to disguise malicious activity as legitimate content, potentially related to command execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://dugedepap.ru/wb?keyword=ib%20myp%20chemistry%20textbook%20pdf PDF link annotation
    • https://rarezeromodon.weebly.com/uploads/1/3/0/8/130874170/rexefiborafaw.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/windows_powershell_commands_cheat_sheet.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/93754156302.pdfIn macro / runtime command snippet
    • https://mavekajokirusap.weebly.com/uploads/1/3/1/4/131437454/2012879.pdfIn PDF document text
    • https://kebekeloku.weebly.com/uploads/1/3/4/6/134639455/jitininej-pasodisewo.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/alesis_dm10_mkii_studio_kit_price.pdfIn PDF document text
    • https://tarezusubem.weebly.com/uploads/1/3/5/3/135386237/pilibuf_gemakesokovep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wuniku/60766462507.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/54875009497.pdfIn PDF document text
    • http://dajizipazubeva.epizy.com/parallel_lines_and_angles_worksheet_grade_8.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/nawosineromigi/xowidakeravasudoza.pdfIn PDF document text
    • http://vukenebavez.rf.gd/kindergarten_counting_1-_100_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/72191591909.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
    • https://s3.amazonaws.comIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 5464 bytes
SHA-256: 316791e7b3f27a7a23a316639c57c20d5fb13ecc26872dba0fcc2949ebc4a379
font_01_sfnt_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 10964 bytes
SHA-256: 94aae98ccf82b5d3372b9c314e99324f1b2bd8edde2d283e49412baedb42ec14

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