Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56578928e3a58d0…

MALICIOUS

PDF

82.8 KB Created: 2021-04-09 14:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 61e20a60c276193a05e0dc0ab4c3f69f SHA-1: 40a513b01df4c3bfcae14cba0bc11101298ebcf5 SHA-256: e56578928e3a58d0fdc9b3bb7316fac275c2014fe5aa888aa3d091afc60885a0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection.

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://dugedepap.ru/strik?utm_term=the+hobbit+book+and+movie PDF link annotation
    • https://dofipoxadule.weebly.com/uploads/1/3/4/3/134314370/6177510.pdfIn PDF document text
    • https://rozigakix.weebly.com/uploads/1/3/2/3/132303329/dalarum.pdfIn PDF document text
    • https://rakiletapaleta.weebly.com/uploads/1/3/1/8/131856645/bolorifapa.pdfIn PDF document text
    • https://jejenami.weebly.com/uploads/1/3/4/6/134684972/xumogur_podixifo_lorageg_relebegariw.pdfIn PDF document text
    • https://janolonixo.weebly.com/uploads/1/3/3/9/133987325/zipenoje.pdfIn PDF document text
    • https://luvisumor.weebly.com/uploads/1/3/5/3/135390586/7705183.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/95732222825.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404292/normal_5fec93d2096d5.pdfIn PDF document text
    • https://sevanilab.weebly.com/uploads/1/3/1/4/131437268/zukafuravegitemunipo.pdfIn PDF document text
    • http://ledimpress.biz/revefoneratokubarjk5q.pdfIn PDF document text
    • http://kikifikoxije.mypressonline.com/2kd_engine_timing_marks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470207/normal_6016c1b75c6e7.pdfIn PDF document text
    • http://fifamarketbot.com/what_really_causes_high_blood_pressure_in_pregnancy8kly6.pdfIn PDF document text
    • https://kozinawesi.weebly.com/uploads/1/3/3/9/133997283/8a358.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374376/normal_5feb95f6b9d7c.pdfIn PDF document text
    • http://j3vnci4.xyz/puxetobejo2dzw2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuzulaj.rf.gd/romeo_and_juliet_act_3_scene_1_study_guide_answers.pdfIn PDF document text
    • http://kokiralasido.epizy.com/st_john_bible_quiz_malayalam.pdfIn PDF document text
    • http://povodakav.myartsonline.com/jurozovetubizakomusota.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_off0000ef35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 4972 bytes
SHA-256: aaca1326c7cce9963ec92335542f20b851e12ecb7708134c7ca19f648cf46d80
font_01_sfnt_off0000fffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 11936 bytes
SHA-256: d20655c475cd479b71ed078f9a628eee0a671c0211c5eb1dd9be1b07b0fa01c4
font_02_sfnt_off000127e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E0 16036 bytes
SHA-256: 0fe8aa14d08365d6f8b61b1bc8ff310bb462f18a21f3c7286266bd86e60ec020

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