Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba877c7b37b7feef…

MALICIOUS

PDF

86.4 KB Created: 2021-02-15 12:50:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e78e9ddb688cb7c9c66c34474c1605c5 SHA-1: 4c69e9b2e085356e9b5e352e0b827085bbcdf088 SHA-256: ba877c7b37b7feef598c9bd1f88fb7e53bf0bd9013ccc4016ffc5b631053928a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URIs indicate a phishing or content manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/wb?keyword=the%20eyes%20of%20the%20dragon%20book PDF link annotation
    • http://steelsho1.club/olsat_practice_test_3th_gradexv8tq.pdfIn PDF document text
    • http://gomunawuwox.22web.org/87764176264.pdfIn PDF document text
    • https://zeleloda.weebly.com/uploads/1/3/0/7/130776222/tulitu.pdfIn PDF document text
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/datozobopelama.pdfIn PDF document text
    • http://legalvictory.group/lojanujunifadebigimudimvpys.pdfIn PDF document text
    • http://axecheat5.xyz/fiber_cement_asbestos_sheets5szb.pdfIn PDF document text
    • http://tukudetu.iblogger.org/labusixitukubisurubewalik.pdfIn PDF document text
    • https://bagamijak.weebly.com/uploads/1/3/1/3/131380043/1727419.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://s3.amazonaws.com/purawuma/application_writing_format_in_marathi.pdfIn PDF document text
    • http://rutuvofogiseba.epizy.com/62241663595.pdfIn PDF document text
    • http://guxajez.rf.gd/zabivuvu.pdfIn PDF document text
    • http://dejanubotikepiw.rf.gd/auxinas_en_lentejas.pdfIn PDF document text
    • http://xiwaresijo.epizy.com/69952489457.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/puxubiketozuvakivafuxare.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/33159029484.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/japan_guide_hiroshima_miyajima.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/feet_to_inches_worksheet.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_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 5132 bytes
SHA-256: aaa55be2a61e99430dc844d25ab4fbfa6f30451545849c9b9cb5e3f0a0796a52
font_01_sfnt_off0001186f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186F 11228 bytes
SHA-256: 4012fef8a20dc300cf84e78459f5fbb795bde917024f37ec050afebdaf370fe1
font_02_sfnt_off00013eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAC 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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