Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f66948e57d536e…

MALICIOUS

PDF

75.0 KB Created: 2021-04-01 07:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9920ecd3aa3b34a62a2cf9e7d0262937 SHA-1: d82149f1279fd0ddb94154bf48bcfc693e5d8991 SHA-256: 18f66948e57d536e5ed85a0ebac358b0162f52cf00e447f40bfb52776f9e03c3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://lozipotod.ru/strik?utm_term=sears+craftsman+garage+door+opener+code+change PDF link annotation
    • https://cdn.sqhk.co/zezetemirag/J8hiRhg/lm358d_datasheet.pdfIn PDF document text
    • https://cdn.sqhk.co/navozaxezini/JidcSgf/sokivi.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzukada/wiegghb/introduction_to_chemistry_vocabulary_review_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/jusigexovoz/25zdjhd/62234485025.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/hdjeFjf/82150905902.pdfIn PDF document text
    • http://filozajerezabi.getenjoyment.net/gopugiwujazitivuvarosowi.pdfIn PDF document text
    • https://cdn.sqhk.co/sogunixe/37ihjbD/45089327887.pdfIn PDF document text
    • https://cdn.sqhk.co/muwitajo/Tljbmr0/tumaxeliwudediwuguneji.pdfIn PDF document text
    • http://xuwiropexij.iblogger.org/34355807574.pdfIn PDF document text
    • https://cdn.sqhk.co/lizubenesowi/hAhbMhh/withings_scanwatch_review_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/poxedomeke/gjijhhd/vocopro_gig_star_setup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vomematomeze.epizy.com/teriloroludelawijozog.pdfIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_c6ae564138e64e93b9debda24f134c1f.pdf?index=trueIn PDF document text
    • https://cb705b04-a904-4f11-a6d0-9d7e2b1ae5cb.filesusr.com/ugd/53498d_c9e56d5657e34f27a0ebabb281f3d0bd.pdf?index=trueIn PDF document text
    • http://xenezipulugiji.atwebpages.com/flight_of_the_bumblebee_clarinet_and_piano.pdfIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_2270e27e53124a2f95a41954eb73c1a1.pdf?index=trueIn PDF document text
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_22b9f61ca38d47d6be033ee5e21fdb18.pdf?index=trueIn PDF document text
    • http://sokipev.epizy.com/79662370306.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_b846ddc6f1eb4fb5a5d1f3b1e7ef4302.pdf?index=trueIn PDF document text
    • https://88e92b2d-3ddf-41b2-a2ae-4af48bfba274.filesusr.com/ugd/b74686_ef3b868e2f7f4c719b663bef8a12e833.pdf?index=trueIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_befdfe0650054cac990d42d1e064517c.pdf?index=trueIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_c8abcec1ca8b4f23801ba62631c8e9a3.pdf?index=trueIn PDF document text
    • http://doriponesarom.myartsonline.com/61067155542.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A0 5380 bytes
SHA-256: 8a5b84e3a4551dd6548210b4b2c9b6fd374cc6675979cc51a10ab7c0a55b1eee
font_01_sfnt_off0000eba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 10484 bytes
SHA-256: 77f68fde3190b59aec16998ab91010753cb0f02dbead350b8c97f5b5408d616a
font_02_sfnt_off00010f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176