Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8aa7eb0ecf1ae68…

MALICIOUS

PDF

77.4 KB Created: 2021-04-03 18:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7158c34257c09a315431962aa238d40 SHA-1: dc59864721aab38a15195e8f17270a4edfe74e7e SHA-256: e8aa7eb0ecf1ae68df95dc4cffd1b760a332f6ad3bc0c98c3221aa1feaaca210
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary focus on directing users to 'nipisod.ru'. This heuristic, combined with the ClamAV detection and ML classifier flagging, strongly suggests a phishing or malicious content distribution attempt. The document body, though heavily obfuscated, appears to be related to search keywords, reinforcing the lure. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wix?keyword=apes+2009+frq+answers
    • https://static.s123-cdn-static.com/uploads/4529780/normal_6007067354419.pdf
    • https://cdn.sqhk.co/gevanadu/he5hihf/pigexuju.pdf
    • https://cdn.sqhk.co/pinepopowig/djgn6B7/oscar_the_grouch_trash_gif.pdf
    • http://interior.estate/beauty_is_in_the_eye_of_the_beholder_meaning_in_marathim2v3v.pdf
    • https://cdn.sqhk.co/buxifuludo/iPtnhfS/cartoon_hd_android_app.pdf
    • https://static.s123-cdn-static.com/uploads/4459321/normal_5fcfafc8389a2.pdf
    • https://cdn.sqhk.co/wajidafix/Ckgdwdg/fashion_mumblr_christmas_gift_guide.pdf
    • https://static.s123-cdn-static.com/uploads/4370764/normal_6006806a4132c.pdf
    • http://pc-remont.website/75357284260r1vfp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/solonebosop/tone_it_up_protein_balls_recipe.pdf
    • https://uploads.strikinglycdn.com/files/a1d8074b-8b9e-4686-8bbd-268ade3e156a/86362105604.pdf
    • https://uploads.strikinglycdn.com/files/b6a557ee-61d0-4999-8eb4-048e4501742b/ponog.pdf
    • https://s3.amazonaws.com/vebisop/john_deere_345_parts_kijiji.pdf
    • https://s3.amazonaws.com/norozovijalu/vuxig.pdf
    • https://s3.amazonaws.com/sasufufa/bedapodugifo.pdf
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_77765411d3bf4c30b3a77261d3e8ab0a.pdf?index=true
    • https://s3.amazonaws.com/napisakaluja/munifawiwenexozumeb.pdf
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_016d414b6fcd47f5a134cbed1b377f1a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3e3fafcc-042e-416e-a9a1-99b022321b7f/60144880239.pdf
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_a4920fadfbcf4c1a924f6efb30dba9ec.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0cf.bin
693c400df162557fc7b28303d5112100c5d231162cb20da7415f1c1b079f58d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 5500 bytes
font_01_sfnt_off000103a4.bin
68676746899e20e3b138a722b6cdd398a6ff9d89f242619602d47d7894f256ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 10844 bytes

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