Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f269a0969c6fd4…

MALICIOUS

PDF

78.0 KB Created: 2021-05-06 10:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ffb3d5384e2a1c9168b18c45d77f8d9c SHA-1: d7762b313c27d5812e56488863ddaaa1b41969a8 SHA-256: a1f269a0969c6fd45e5ce733fd51d68ba72d3fb1ed13871c5c80828136157ecf
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicative of a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate maliciousness, specifically classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to lure users to external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/strik?utm_term=thinking+and+destiny+quotes PDF link annotation
    • https://cdn.sqhk.co/pabefidinaz/a3U7OEl/20907886987.pdfIn PDF document text
    • https://cdn.sqhk.co/xubuzivo/ljdijR8/color_bump_3d_2dx.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/hDiiehe/telecharger_bible_francais_louis_segond.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/zedulotimof.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/ladiburonedas-pazikoz.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/sanikujun.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/iMgjsgf/mens_braids_hairstyles_2018_pictures.pdfIn PDF document text
    • https://pesosadat.weebly.com/uploads/1/3/4/8/134885101/2451405.pdfIn PDF document text
    • https://cdn.sqhk.co/pofoxubo/NMUjinp/fizikelitunajime.pdfIn PDF document text
    • https://cdn.sqhk.co/duxevowoli/UiauBhi/gunship_battle_total_warfare_wiki.pdfIn PDF document text
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/febol_vesazemud_fegot_jezugap.pdfIn PDF document text
    • https://cdn.sqhk.co/dojoxuwote/cThgjgC/murder_in_the_alps_energy_refill_time.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ligole/40539865814.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/84275888614.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/rubunajavupiduwaniji.pdfIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_65340ecb14e4472892446b6e4b0d8ae7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/ielts_speaking_samples_with_answers_band_7.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/rawomipolubegeronumur.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_432ebb8f57bf420d837c38afcf71ec3b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vufupu/vabunu.pdfIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_47dad5832b4a4204be51aa7aed5b7a11.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pogolo/microsoft_flight_simulator_2004_pc.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_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 5200 bytes
SHA-256: f76d161f133a3e0cd08ec87f08d49a81c8afa98c3f59b23e1c0814942b316663
font_01_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 10636 bytes
SHA-256: 57e79a393e22c317d6de35af99f68a697f5e14c9770aa905abfb46a132b01010