Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6cfd1fe39606ff…

MALICIOUS

PDF

73.3 KB Created: 2021-02-23 22:01:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ced36a206e3f7d3d966414383d297cb3 SHA-1: 5f0a68483c51a5b1f2b07c4f75d8d931914f28f4 SHA-256: 7f6cfd1fe39606ffe829c0dca48ec8644afe0c8f6b64fc008b97ff4fc9f59216
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=batman+beyond+comics+read+online In PDF document text
    • https://fivosegexaf.weebly.com/uploads/1/3/2/6/132683078/ac7949c54.pdfIn PDF document text
    • https://rexerobebaru.weebly.com/uploads/1/3/1/8/131872155/e13ab8.pdfIn PDF document text
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/xoreri-bisinisur.pdfIn PDF document text
    • http://pelistens.xyz/67261404237yy75q.pdfIn PDF document text
    • https://zaxivufib.weebly.com/uploads/1/3/5/3/135306799/0e7acdc20771.pdfIn PDF document text
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/letigiwepif.pdfIn PDF document text
    • https://fatibetoliwan.weebly.com/uploads/1/3/4/7/134731660/d2b5531290a.pdfIn PDF document text
    • https://tesurupijirixu.weebly.com/uploads/1/3/0/8/130813669/mazano.pdfIn PDF document text
    • https://tukumexof.weebly.com/uploads/1/3/4/7/134721389/kukibomotufa.pdfIn PDF document text
    • http://itclick.pro/how_much_is_the_rarest_50p_worthphtf2.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/retisovojor/fuse_template_icons.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/chloroform_test_for_halogens.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/58157015049.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/star_wars_age_of_republic_villains_read_online.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/alfabetismo_visual.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/pexujiga.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE381 5376 bytes
SHA-256: a7a77dc4913d2e995a36e9095ac41bbb51944ab5ae449943738211d588474dcd
font_01_sfnt_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 10120 bytes
SHA-256: 45f42a471e877cdf70cfd2fb17e5e083705ff15a6908dfa270e09bc9efb5980b

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