Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45dc870aaeb7bb0…

MALICIOUS

PDF

78.4 KB Created: 2021-05-08 17:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 13e16560f5a1cb41b2910810f7a6a011 SHA-1: 503c5d6eab1b9f55a48dfc95b4ba928fe06da979 SHA-256: a45dc870aaeb7bb0949b2c40cae754f38e7adbfadbddf9d684cacf2321d69703
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://maypoin.ru/strik?utm_term=the+hunger+games+mockingjay+part+1+netflix+release+date PDF link annotation
    • http://ruzazeruduzelu.22web.org/89545816602.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415524/normal_5fed221826c2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426695/normal_6036df0c214bc.pdfIn PDF document text
    • https://zewelujipe.weebly.com/uploads/1/3/4/8/134846298/9087722.pdfIn PDF document text
    • http://simamopi.22web.org/7622827002.pdfIn PDF document text
    • https://tuduzijusesuzi.weebly.com/uploads/1/3/1/4/131406801/2784956.pdfIn PDF document text
    • https://vewosofi.weebly.com/uploads/1/3/4/4/134493368/44fc88eabaedc3.pdfIn PDF document text
    • https://gawokuvaz.weebly.com/uploads/1/3/4/6/134656265/rusena_wanupuwun.pdfIn PDF document text
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/4309974.pdfIn PDF document text
    • https://zuwubusonelab.weebly.com/uploads/1/3/0/7/130739898/doxozozu.pdfIn PDF document text
    • http://zobebukore.22web.org/avatar_the_last_airbender_comics.pdfIn PDF document text
    • https://nofodomeki.weebly.com/uploads/1/3/1/8/131871852/vararoxeruma.pdfIn PDF document text
    • https://togoxijagujeg.weebly.com/uploads/1/3/0/7/130775712/4b3546989f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375698/normal_5fd2c0c6a7acb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lapodalojowev.rf.gd/72847947416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45736406-fb9d-4dfa-a876-ec644d7499b7/26328940522.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/audiolibro_el_alquimista_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0446220-67d0-4c8a-a665-998c85fa4c41/71833708953.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/wwe_champions_2019_apkpure.pdfIn PDF document text
    • http://kufuravolej.rf.gd/xelebunarutivelivezuwaful.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 5880 bytes
SHA-256: a545f7045f2a33dfd33bd6ef3e4eb67ae5275d310762cbbeb89fa9a79ace1d84
font_01_sfnt_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 11444 bytes
SHA-256: 797815989ae027be94fa4b8abc013e92122171923393c7282d05cb5a97486243

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