Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3acd92f4af2e2df…

MALICIOUS

PDF

102.2 KB Created: 2021-06-10 11:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 48fd6a72242b52f78d23722a2750ea15 SHA-1: f7524143f18bad49c5f6cde823f5bd54e2cb16fa SHA-256: a3acd92f4af2e2dfe40f635cbc63a92f6ddbcbfe5aa3ab725a1c3e1e9f066f24
226 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, employing a link farm strategy to direct users to various PDF documents hosted on disposable platforms. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs users to download password-protected archives, a common tactic to bypass security scanning. The presence of numerous external links, including those on Weebly and PBworks, suggests an attempt to obscure the malicious intent and distribute payloads indirectly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jottigo.ru/123?utm_term=blackmagic+micro+studio+camera+4k+manual+pdf PDF link annotation
    • https://dusukipujadun.weebly.com/uploads/1/3/1/4/131437174/nadebumawojujegofox.pdfIn PDF document text
    • https://fupevigojajoma.weebly.com/uploads/1/3/0/7/130738700/tijipetelunagusomi.pdfIn PDF document text
    • https://xudufuzed.weebly.com/uploads/1/3/0/8/130815664/damotitatifuj.pdfIn PDF document text
    • https://sexaxekeka.weebly.com/uploads/1/3/5/3/135313825/pidutazemuvemako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490534/normal_601d63b18ce1c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4369765/normal_60b64d77eae03.pdfIn PDF document text
    • https://zorovapi.weebly.com/uploads/1/3/2/3/132303286/1b83770b2.pdfIn PDF document text
    • https://xipasole.weebly.com/uploads/1/3/4/8/134853136/56ecfd.pdfIn PDF document text
    • https://wadewasugidaf.weebly.com/uploads/1/3/0/7/130775384/wiwadowamamizolapiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374362/normal_60b7ff00a91df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481411/normal_601855e113d97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_605f4b0cd4b3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393762/normal_5fc9b14fdaf07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144417888/lofisifijed.pdfIn PDF document text
    • http://bizogug.pbworks.com/f/kubotajoveponeme.pdfIn PDF document text
    • http://kuperuxowix.pbworks.com/f/68536930986.pdfIn PDF document text
    • http://zikasamu.pbworks.com/w/file/fetch/144432135/25th_anniversary_quotes_for_parents.pdfIn PDF document text
    • http://wexagiz.pbworks.com/f/how_to_make_easy_slime_at_home_with_glue.pdfIn PDF document text
    • http://xosezoranad.pbworks.com/w/file/fetch/144664107/28745916199.pdfIn PDF document text
    • http://noxiwako.pbworks.com/w/file/fetch/144821100/how_do_i_program_a_clicker_keypad.pdfIn PDF document text
    • http://rezedul.pbworks.com/w/file/fetch/144741588/what_is_passport_size_photo_uk.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_off000134f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F3 5676 bytes
SHA-256: 2ef55be816d43b8fe58644224de3eef90e9ea97224ecbf51ce7c3466dbb01bc2
font_01_sfnt_off00014843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14843 14288 bytes
SHA-256: 8ab0746ba02e338dca724ef6d4aa974c09d1b50506cb68de57f1187132e4f19d
font_02_sfnt_off00017406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17406 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953