Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f62c1df8be02ee9…

MALICIOUS

PDF

85.9 KB Created: 2021-04-06 05:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c83f7517c14d5db9697999546575792d SHA-1: 170e88f39687de209c1c95d7b7a18df5b7b1ddea SHA-256: 8f62c1df8be02ee9394f38319c125b9047e08e4a58362020cfa9ecc745a3228b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs are likely intended to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/wix?keyword=pathfinder+bulette+armor PDF link annotation
    • http://sopafekidis.sportsontheweb.net/lusipazugufiwozemeguta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448121/normal_5fc9884b009ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412380/normal_60377f86d65c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_601f5918e6584.pdfIn PDF document text
    • http://suporefebakibur.mygamesonline.org/adjacent_channel_interference.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_80ff90ccee694d76ac0642c573c67191.pdf?index=trueIn PDF document text
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_e75dd91d000f4ad8891d79f90e57c1e3.pdf?index=trueIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_a825b98c9ecb4767892cdd6cc0ebfa75.pdf?index=trueIn PDF document text
    • http://luvoximod.epizy.com/thinking_in_java_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/minn_kota_riptide_terrova_i-pilot_12v_54in_motor_with_55lb_thrust.pdfIn PDF document text
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_17143f740dec4f32b9868e6c089944a5.pdf?index=trueIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_84c82d0485ca4fba8d4ee7ea634f7278.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/lajovoxovon.pdfIn PDF document text
    • http://sirovorisolilu.rf.gd/jupugaxamatinanebuj.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/chennai_airport_images.pdfIn PDF document text
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_67b86a199f504b6cb63761c755807205.pdf?index=trueIn PDF document text
    • http://fupenidiwed.rf.gd/kohler_command_pro_27_ignition_coil.pdfIn PDF document text
    • http://mijikabetabup.rf.gd/lewadese.pdfIn PDF document text
    • https://bb209e34-24c3-4901-88bd-c00af8cda710.filesusr.com/ugd/de6798_e7ff33a65f4147d7a1813f0627c8674c.pdf?index=trueIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_6e30e2861eac44b79c8909e33f5f6baf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/81050144529.pdfIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_2b892f283ba049c5b072c485934259b4.pdf?index=trueIn PDF document text
    • http://pulutugorivexek.atwebpages.com/mvcc_financial_aid_email.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 5112 bytes
SHA-256: 51c2e800dc92f5742d88ae5d00959bc451140c340a5cb494d2a1586e7395e03e
font_01_sfnt_off00010b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 11408 bytes
SHA-256: c9e37f61ef55e0da79cfe9f607aa135ed53c73b59324e8d272c8abacf2c7cec6
font_02_sfnt_off0001323f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323F 16836 bytes
SHA-256: b7b992bf31901aaa79305d56c8a20430e6489b0c5e220d3fd2e184621e364ac8