Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38f8aa6543dda7b…

MALICIOUS

PDF

75.7 KB Created: 2021-03-20 21:23:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b4abaae2d5c81ca3e90a70a18e5ceec6 SHA-1: 862c15bc0fd977d562e4cdc40c5ade5d651796cd SHA-256: a38f8aa6543dda7b04e197fac91d7756d8f635fa5cf7cf0073d39d374b2824ce
186 Risk Score

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 0.9991

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://soxebez.ru/aws?utm_term=parallel+processing+books+pdf PDF link annotation
    • https://luragelekow.weebly.com/uploads/1/3/4/3/134377287/dojif-balofume.pdfIn PDF document text
    • https://menudobuwowewil.weebly.com/uploads/1/3/4/7/134765252/ebf44.pdfIn PDF document text
    • http://komunomaled.iblogger.org/are_there_any_book_series_as_good_as_harry_potter.pdfIn PDF document text
    • http://fadomofikupiviv.iblogger.org/sojavarojogizeduvike.pdfIn PDF document text
    • https://kuginipa.weebly.com/uploads/1/3/4/8/134853520/lufevujimedumab.pdfIn PDF document text
    • https://nibiromevisike.weebly.com/uploads/1/3/5/2/135299411/jiwiveramowiwuxapeza.pdfIn PDF document text
    • https://juwujumatel.weebly.com/uploads/1/3/4/0/134042908/8626824.pdfIn PDF document text
    • https://linepofikoleku.weebly.com/uploads/1/3/4/4/134492010/fojowot.pdfIn PDF document text
    • http://jijimaxugixu.22web.org/answer_2019_gear.pdfIn PDF document text
    • http://vejofewi.iblogger.org/ginesapadewubatibuz.pdfIn PDF document text
    • https://rixafivi.weebly.com/uploads/1/3/1/3/131380000/5524b.pdfIn PDF document text
    • https://gakutuzopekok.weebly.com/uploads/1/3/4/6/134605442/65d1fccac.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/nijudow/metadata_schema_template.pdfIn PDF document text
    • http://mukokulag.epizy.com/pevoxiram.pdfIn PDF document text
    • http://momugegunimex.rf.gd/marvel_comics_avengers_characters_list.pdfIn PDF document text
    • http://pamanivu.epizy.com/pediatric_appendicitis_score.pdfIn PDF document text
    • http://jufosuliz.epizy.com/alcoholism_treatment_guidelines.pdfIn PDF document text
    • http://sizixezaratog.rf.gd/32706100462.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/risofo.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/albertine_kayp_in_english.pdfIn PDF document text
    • http://nawupewiviziwik.rf.gd/9995137878.pdfIn PDF document text
    • http://luxoxuwaf.epizy.com/dd_3.5_artificer_handbook.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/can_a_treadmill_work_without_a_safety_key.pdfIn PDF document text
    • http://pisasegobure.epizy.com/how_to_get_alexa_to_make_a_fart_noise.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_off0000e6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E6 5528 bytes
SHA-256: 613a835a2d17c6c99f38c96946651cd9f3351624d9f9d5b92fcf4058b3d652ab
font_01_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 11704 bytes
SHA-256: 666d6b76b11753936344c78d6db2604394df88dcfab5e1feb6b52728fdfa7526

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