Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f62f7975b94d78…

MALICIOUS

PDF

82.4 KB Created: 2021-03-23 16:09:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 90f5fa0d75fb52323c945007e2f5390c SHA-1: 92d9b964ae2133de5f8e91b17b01aabf2c10bdc0 SHA-256: e3f62f7975b94d78c48b625236d9706b399e308663b3b50aa2678e874b40ce2b
226 Risk Score

Malware Insights

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

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 0.9989

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://fokemale.ru/wix?keyword=apk+atv+launcher PDF link annotation
    • http://securitycheckingbrowservkcom.xyz/39678694221nxtcd.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/hcgghjU/the_impossible_game_cool_math.pdfIn PDF document text
    • http://film123watch.com/60126380459vsqjj.pdfIn PDF document text
    • http://securityverifiedservices.com/tebavuxakemitajuqbdrp.pdfIn PDF document text
    • http://islemleriniz.org/18967002614pz1te.pdfIn PDF document text
    • https://cdn.sqhk.co/kakovavop/drNKLVJ/timed_screen_lock_android.pdfIn PDF document text
    • https://cdn.sqhk.co/lukumuzu/igdFgik/90503255765.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_59950c67ed0449e1b80290ea254a2e1a.pdf?index=trueIn PDF document text
    • http://fixorafusadaxuk.rf.gd/aol_instant_messenger_old_version.pdfIn PDF document text
    • http://mirenefomex.rf.gd/limestone_calcined_clay_cement.pdfIn PDF document text
    • http://xinirujoki.epizy.com/jikim.pdfIn PDF document text
    • https://b6e49935-6d58-4bde-831f-6e0b746776d3.filesusr.com/ugd/7d321f_39580f5cd7a440c3bf21197ec31f8ec1.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_b61b19198d884ed2bbcb9f33f2587442.pdf?index=trueIn PDF document text
    • http://tapipawobux.rf.gd/genetics_biology_textbook.pdfIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_52139bd8d60d43c4904743dec6c52f83.pdf?index=trueIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_30b035c8bfb64bd9a5fd2c9b64f54ef5.pdf?index=trueIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_556c4e88996640699d416f2fd27134ba.pdf?index=trueIn PDF document text
    • https://efe523a3-d756-4f55-ba91-412f3a718e00.filesusr.com/ugd/236571_299fecfea57849ebbbea68263f58c7d7.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_53cfb2a68bbc4a6ea1e10d5a90c0a7f9.pdf?index=trueIn PDF document text
    • http://mifumupesa.rf.gd/sydney_bouldering_guide.pdfIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_70bf74cbd996422bae23db4b2843a62b.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_43db20173cf84a2aa1dbb2113d267996.pdf?index=trueIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_bea12b41418d4d7da32e7616f30ace3d.pdf?index=trueIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_fcbcb60b55054eafa16948e6b65ebd07.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011b3d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11B3D 19632 bytes
SHA-256: fd6081645fbe4fad852b06abcd0782aebdb6bd042080bf09abbf18d27ccf8ab3
font_00_sfnt_off0000d7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DE 4956 bytes
SHA-256: 4d9c782611d706bda723ec3a48a4d0c475f8d6853e136c4d25c536ecd69407e5
font_01_sfnt_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 21492 bytes
SHA-256: 780ced8bf553ac0bc8fd0c1b64b441ede27b10d72a3371d3b7a736fe6b5c4d16