Malicious PDF — malware analysis report

Static analysis result for SHA-256 3591439011b71799…

MALICIOUS

PDF

66.9 KB Created: 2021-02-18 06:29:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 0056065d7cbcf3d757be3d21f816466b SHA-1: 228a27d91deb778dfeeb308e8f0c3e85a369571f SHA-256: 3591439011b71799bbf99d67f65795fe41871a579cf343e37b846ecc3096056e
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also flagged the PDF with high confidence. The document body, though heavily obfuscated, suggests a lure related to financial documents, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=construction+income+sheet+pdf In PDF document text
    • https://ruxevikupasej.weebly.com/uploads/1/3/4/6/134663562/fowudi.pdfIn PDF document text
    • http://zefabafiw.22web.org/canada_food_guide_2018_for_pregnancy.pdfIn PDF document text
    • http://getyourscore.info/fivozuwuzaxivoxafixlraai.pdfIn PDF document text
    • http://item-get.top/20172000783yyjpo.pdfIn PDF document text
    • https://nevedaroxizewav.weebly.com/uploads/1/3/4/5/134592578/c127746c9d3116.pdfIn PDF document text
    • http://classkaod.ru/boohoo_meme_funnypbky4.pdfIn PDF document text
    • https://fogevama.weebly.com/uploads/1/3/1/1/131164507/631924.pdfIn PDF document text
    • https://tefovaxosu.weebly.com/uploads/1/3/1/1/131163863/646986.pdfIn PDF document text
    • http://espaceabonnes.com/mijimuto8nx.pdfIn PDF document text
    • https://ladufuvugekowek.weebly.com/uploads/1/3/4/1/134108614/xuxuf.pdfIn PDF document text
    • https://limuvowefegepud.weebly.com/uploads/1/3/4/5/134509231/gakuluvigebitofe.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/wupixufekijax/android_developer_mode_usb_debugging.pdfIn PDF document text
    • http://jilevatawew.epizy.com/mezevumovuxamazuviku.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/oregon_accident_report_online_form.pdfIn PDF document text
    • http://vinegufoxa.rf.gd/cha_cha_cha_songs_free.pdfIn PDF document text
    • http://xazomagojuwa.epizy.com/gujamopemonovokuwuj.pdfIn PDF document text
    • http://zedaziwubisod.rf.gd/80190483043.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/1689236162.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/jubaterulenopuzolezugix.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_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 5056 bytes
SHA-256: cf5904897a9afb5af89dc24b713ff4bbd85effb848df7ba03560fc8ce499e508
font_01_sfnt_off0000de19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 9668 bytes
SHA-256: 4cf471f693525fe7bad1455228febb49c04784f0e479db5eb638dc467a76bf38

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