Malicious PDF — malware analysis report

Static analysis result for SHA-256 f169f8a3e5e73cd3…

MALICIOUS

PDF

83.6 KB Created: 2021-02-12 14:02:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa9cc59e12a633a2111458119379d7c6 SHA-1: a7359d65d86c676c01a39f9371c3f0e25749b7c2 SHA-256: f169f8a3e5e73cd3a4fead50634f4fa1083944b2c19dbdffdec527f1ed7bfe27
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=rebounderz+waiver+form+pdf
    • http://uaregroup.com/majodokaduzixumemekemes1wykl.pdf
    • https://cdn.sqhk.co/gadukupuwe/Vt79omS/70215263747.pdf
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/8712013.pdf
    • http://pro-komp-master.website/kokatewowasepiwiriburpi837.pdf
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/3170401.pdf
    • https://boxizegovabore.weebly.com/uploads/1/3/1/3/131379280/wikexevonuvapu_zokijizopubepa_tesilanid_gepatiruvapawiv.pdf
    • https://vuzipelafow.weebly.com/uploads/1/3/4/6/134688966/kevanam-nokowanunabomin.pdf
    • https://static.s123-cdn-static.com/uploads/4410004/normal_60043f62e3040.pdf
    • https://cdn.sqhk.co/rejiwosujupa/1dkhfYk/ruwumoxudubokolomaretet.pdf
    • http://tamakar.xyz/bazajelakadloj1.pdf
    • https://cdn.sqhk.co/jasowipe/Ehcf1ge/shelter_insurance_login.pdf
    • http://regvoolkim.website/wow_classic_hunter_leveling_guide_kargozkstcx.pdf
    • https://cdn-cms.f-static.net/uploads/4454811/normal_600b606bb84a1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fuzafuzeruwit/outlook_app_android_contacts.pdf
    • https://s3.amazonaws.com/rivazixexuguri/rakixunewirogenebosomejaz.pdf
    • https://s3.amazonaws.com/kibavutibeved/curriculum_guide_in_english_grade_7_2016.pdf
    • https://s3.amazonaws.com/kubedukowug/badmash_full_form.pdf
    • https://s3.amazonaws.com/paxuvagal/kejujagisumuretiluna.pdf
    • https://s3.amazonaws.com/bededuxotulapil/video_maker_windows_7_software_free.pdf
    • 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_off000109da.bin
d2ee48da9319008403c1d3768102f55ae25a1ee4185f03998575631ad038f87f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 5328 bytes
font_01_sfnt_off00011c04.bin
3adb830280c6b354bace48b3caba4809684958ae1dcdd1b751f3c60e7d3b8172		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C04 10764 bytes

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