Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf9053b6be68407…

MALICIOUS

PDF

88.0 KB Created: 2021-05-12 08:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 22b701bc893d878d86174fb7334c52d4 SHA-1: 27841123547b4e4d8875dc98a3d26024c9e01e0c SHA-256: 1bf9053b6be6840744d2594f6b08afbdeff7c22340dcf0e09b6ca6cab8dac164
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and point to redirectors, indicating a phishing or malware distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. Although no scripts were extracted, the document's structure and URL patterns strongly suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=irregular+verbs+list+german+pdf In PDF document text
    • http://curvepreloved.com/let_us_come_boldly_unto_the_throne_room_of_graceziwxh.pdfIn PDF document text
    • http://jisetatiloro.scienceontheweb.net/lujon.pdfIn PDF document text
    • http://legrand-spb.ru/xiwofewefeglugik.pdfIn PDF document text
    • https://dexapapasogixeb.weebly.com/uploads/1/3/1/3/131384013/jewesunesubofimizulo.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/manual_seiko_7t62_espaol.pdfIn PDF document text
    • http://vepozatab.22web.org/jepuzuwewizozonupufu.pdfIn PDF document text
    • http://cpskras.website/xufomaxaxavepurelakelybdw0.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://labopepiw.weebly.com/uploads/1/3/4/7/134747507/f142f139ce36c1.pdfIn PDF document text
    • http://wofonefa.iblogger.org/food_adulteration_wikipedia.pdfIn PDF document text
    • https://xaxexuwolak.weebly.com/uploads/1/3/5/9/135978614/2467165.pdfIn PDF document text
    • http://helpverifybadges.com/bezupuzonafapunasojere0g7fk.pdfIn PDF document text
    • http://filemarker.store/94507612754tzff1.pdfIn PDF document text
    • http://rukozhop-guide.com/sanyo_tv_mount_screw_sizer1ize.pdfIn PDF document text
    • http://fsbsiod.com/string._format_java_long0pmd7.pdfIn PDF document text
    • http://fidafevemikiwe.mywebcommunity.org/13337420857.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dokedajonanumi.rf.gd/south_film_ing_movie.pdfIn PDF document text
    • http://lukoleni.epizy.com/49900243808.pdfIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_087858cc430a4cf292d115a66382cfe8.pdf?index=trueIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_74ad515225bc4f989633a6cec9ad7721.pdf?index=trueIn PDF document text
    • http://tukudapig.epizy.com/kugobose.pdfIn PDF document text
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_d8966712f15d4718bff5dce68b344059.pdf?index=trueIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_45b81a1c524d4637a877f764eaa8324b.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://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_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 5496 bytes
SHA-256: 9130fbb37f2c244dc0c4e64570e1dbcec7f56589adff73466bae4ed84346b458
font_01_sfnt_off000115b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B2 11260 bytes
SHA-256: 0242b3fea0b319d5f48468bfce36d96e180d7c1ea4c2bcae64d54f1da06ee30a
font_02_sfnt_off00013b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B74 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd