Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21be21e68e9b67d…

MALICIOUS

PDF

73.8 KB Created: 2021-01-20 05:20:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: fbc35bb507fcb48191032704345fdcc6 SHA-1: 707b4be108bc08f3a1c78ddefc06fd740e114d1b SHA-256: a21be21e68e9b67d3abc827a88a5c39aa6beb65b4fc268f1b4128cffa41e6544
196 Risk Score

Malware Insights

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

This PDF document exhibits social engineering tactics, specifically a 'ClickFix' style attack, by presenting a fake 'Your organization requires a new pin personal computer' to lure the user. The presence of numerous external links, including a link farm, suggests an attempt to redirect the user to malicious content or download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute code.

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://jottigo.ru/123?utm_term=your+organization+requires+a+new+pin+personal+computer PDF link annotation
    • https://cdn.sqhk.co/fipimomozuk/jciijaa/fegudi.pdfIn PDF document text
    • https://dijibelusubif.weebly.com/uploads/1/3/4/8/134871127/9522233.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/hfNs3qs/dhoom_machale_dhoom_1.pdfIn PDF document text
    • https://metenesepagozo.weebly.com/uploads/1/3/4/7/134710396/330430.pdfIn PDF document text
    • https://cdn.sqhk.co/sakiforivona/Lw8hbf8/chicken_gorgonzola_alfredo.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/5l0jaia/12947655037.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/ijqbpig/susatotamomotokimazav.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/ieqkby0/enemy_strike_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_5fba1fe1b8ac8.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/ehgh2oU/13161405199.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/geBuheV/22838115003.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/863c3f2110a8.pdfIn PDF document text
    • https://jikujumek.weebly.com/uploads/1/3/5/3/135318263/22076.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/cijidge/amazon_cat_condo_for_large_cats.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/9hbnha6/zekunoviwomugazononezid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 5480 bytes
SHA-256: d1e084a6b0225a52ff896434c33a7de393da941bdd6f415c6bd8add9f3f33dec
font_01_sfnt_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 2252 bytes
SHA-256: a6a8686b8fb15c9717d15c6992f5cb6599fab98c9eb18a738509255b94a7d84e
font_02_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 10996 bytes
SHA-256: 07e66bc99cfdffc6c01ebcc5d380798d6f87b9c5c3b53f0f15a29d07270d35fb

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