Malicious PDF — malware analysis report

Static analysis result for SHA-256 a907017540a2b4f1…

MALICIOUS

PDF

77.7 KB Created: 2021-03-08 09:52:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e24167777ef276b493ae4c641ce9356b SHA-1: 225f72b5cb0d0ac46f731a98d07d498f9cc6370a SHA-256: a907017540a2b4f159fde21c1e890e0dfe2b520389b043c6f69e3b5b70758375
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a prominent one redirecting through 'bologen.ru'. This URL is flagged as a redirector for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=thermador+refrigerator+price+list PDF link annotation
    • https://cdn.sqhk.co/nabixisaf/hcichfX/49002890395.pdfIn PDF document text
    • https://wipasajumavadus.weebly.com/uploads/1/3/4/7/134775966/valomisenosone-rudekedidive-xewodibirel.pdfIn PDF document text
    • https://taduvovu.weebly.com/uploads/1/3/1/8/131871704/novumulujopizab.pdfIn PDF document text
    • https://cdn.sqhk.co/vadezewe/hdW17RR/jamuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/tjcKhcQ/pocket_rocket_gun_25.pdfIn PDF document text
    • https://wowaximemufa.weebly.com/uploads/1/3/1/4/131453960/vuwagabapanomeli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_42e17a881b0d4eb8ae43d23394e9bae5.pdf?index=trueIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_3f7bc5df1d7c4a50b8bda807630f9c58.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/welanisowari/jung_ilhoon_big_wave.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/neluw.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/common_application_counselor_optional_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/sogijikarano.pdfIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_f6151fdf01d94808b2e3eeaa35bcb756.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/51763828461.pdfIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_3646149aa90f47e791c4c587b7f39599.pdf?index=trueIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_0240ecaedab6463490525d7145183cbe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/make_background_image_repeat_x_android.pdfIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_077d64dd141c4537ab03ca16eb3167bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/nesirixo.pdfIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_866bce2b897e48f4b1b2c31db7b88724.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zupenafud/2148142122.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_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 5516 bytes
SHA-256: 23998b242ae1d1a1fe9f79d6b8ee7bb305aabab53b13358e8d626003c462e249
font_01_sfnt_off00010547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10547 10756 bytes
SHA-256: fd681f57eac7d3be786a829b62571bcb81396c0830f06082528e940d4f302f19