Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5de5249c07dba7…

MALICIOUS

PDF

69.2 KB Created: 2021-03-19 19:24:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f37e0aeef224603c48f25e23ff2d8dbc SHA-1: d0328c87bac56403e35c26f048b49037e02ac379 SHA-256: 1e5de5249c07dba736365d390c6a4c01d202d0a08adc5fef3dff1ca44ce0969d
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution scheme, as indicated by the ClamAV detection and ML classifier flagging it as malicious. The document contains numerous external links, suggesting it is part of a link farm designed to redirect users to malicious sites, with one prominent URL being https://mezovuduw.ru/award?keyword=acupressure+points+pdf+download. The presence of embedded JavaScript, though not fully detailed here, is a common method for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/award?keyword=acupressure+points+pdf+download
    • https://cdn-cms.f-static.net/uploads/4495037/normal_60395dacbca9d.pdf
    • https://minizejemeroro.weebly.com/uploads/1/3/2/7/132740725/5b2a6339cc0.pdf
    • http://nutejujaxi.66ghz.com/49280487532.pdf
    • https://cdn-cms.f-static.net/uploads/4450519/normal_6027ed495e930.pdf
    • http://kirivil.iblogger.org/human_body_parts_pictures.pdf
    • https://cdn.sqhk.co/zemujipuluwo/RgiqThg/81046057489.pdf
    • https://static.s123-cdn-static.com/uploads/4450003/normal_5ff4fa693c719.pdf
    • https://cdn-cms.f-static.net/uploads/4365576/normal_60103a5ce783b.pdf
    • https://static.s123-cdn-static.com/uploads/4414677/normal_5ffb9028cc3b0.pdf
    • https://cdn-cms.f-static.net/uploads/4382631/normal_602b5c56c7ee5.pdf
    • https://static.s123-cdn-static.com/uploads/4483097/normal_5fec33c4c5f23.pdf
    • https://cdn.sqhk.co/kuzosexiwugu/gZUghib/56464507452.pdf
    • https://static.s123-cdn-static.com/uploads/4481662/normal_5ff3de47954e5.pdf
    • https://zesumijiwad.weebly.com/uploads/1/3/0/7/130739983/binev.pdf
    • https://cdn.sqhk.co/pulovafafita/gii2jhI/poxesixevujo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_cf0a9fc69b5a4cbaa86dd3882d60492e.pdf?index=true
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_611a75caf42e4fb7ae27bf07561486f2.pdf?index=true
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_8e7d36de22ac4427adc113d622d2231f.pdf?index=true
    • http://gugamofizuxeg.epizy.com/ic_741_comparator_datasheet.pdf
    • http://lumijezemoto.rf.gd/zaxejuzuvukusifofubo.pdf
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_ec54263536d146b7a62142b88797c31b.pdf?index=true
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_15994c940a2549e9ac11cc79ebc18599.pdf?index=true
    • http://kuwopugivowivo.rf.gd/sentence_guidelines_council.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_off0000d183.bin
2a0ae3835372158a937debc9f5314898913c6fcd84ce2829a67fffade735b4c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 5228 bytes
font_01_sfnt_off0000e36f.bin
293e85f37850dd9e1fab445727216ddb0ac9a0356873d936283a56e749ff52fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE36F 10572 bytes

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