Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fce5e5dfea842a9…

MALICIOUS

PDF

88.9 KB Created: 2021-03-14 07:54:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 240f17bf5fe80708c9d5a34564bd1c0f SHA-1: b30cb7ea65ac8531f22cc7b32a0f00231d53a7ee SHA-256: 2fce5e5dfea842a992a0b8de4620bf7e7d0c040fd7daeb9260737b8cccaa455c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one specifically pointing to a URL that appears to be part of a link farm designed to attract search engine traffic. The presence of many links, including to disposable hosting, suggests an attempt to obscure the ultimate destination or to distribute a payload through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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/award?keyword=bajaj+allianz+life+future+gain+pdf PDF link annotation
    • https://pipoweje.weebly.com/uploads/1/3/1/4/131438571/a63f58d9.pdfIn PDF document text
    • https://wufanamokedig.weebly.com/uploads/1/3/5/3/135326106/8bc7317.pdfIn PDF document text
    • https://xubetiduradana.weebly.com/uploads/1/3/0/7/130739761/nusarukawag.pdfIn PDF document text
    • https://nolabuxovitu.weebly.com/uploads/1/3/5/3/135305824/58277a0.pdfIn PDF document text
    • https://dinasozuze.weebly.com/uploads/1/3/1/3/131383342/junala-kipomomefu.pdfIn PDF document text
    • https://fuwowomazusora.weebly.com/uploads/1/3/4/0/134000162/pusenedadup.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/1df4d782fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2b08f6f7-d37e-4381-999a-b19c92f1e739/stanley_jump_starter_directions.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/back_core_strengthening_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/mubeve.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/what_is_the_organizational_structure_of_a_small_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7cf1bd4-7c04-4701-9f90-2823f63a9772/79582670724.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/74571986611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fb30df4-b56c-4e69-ae0b-7197c138edf9/41739081989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85bd822-1f55-495f-99a6-1d8642bcb21e/jolar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c75d50e5-d961-4912-a81c-0e1b7fc6567c/how_do_you_fix_a_watch_winder.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/what_is_the_best_wifi_extender_for_verizon_fios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bfe720d-1e08-454e-8f9a-12500e73b02d/getemidinogezijaki.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 4976 bytes
SHA-256: 813c0501310c9bc66d6a746a00413c9b00f298d9dd3da613a375117d1075e8c8
font_01_sfnt_off00010a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A11 11864 bytes
SHA-256: 7caf8148bd5196973e71b13b55d1e452895f506d2aab33221810922b533728dd
font_02_sfnt_off000132ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BA 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8
font_03_sfnt_off000147d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2