Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a57ae02b128f2d2…

MALICIOUS

PDF

85.8 KB Created: 2021-05-11 16:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: baf5b6a66ba29a09a1066f45f935fbfe SHA-1: e3742312b53213e4592ed6a1ac810325cc6fe08e SHA-256: 4a57ae02b128f2d27f611ef4fb2ae717732b7e8440a3b56a84e2a5cfa20cd24e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

Heuristics 5

  • 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.
  • 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://nipisod.ru/strik?utm_term=microsoft+excel+assignments+for+beginners PDF link annotation
    • http://creditstar-kabinet.com/words_from_the_song_what_a_wonderful_world_that_appeal_to_your_sensesg9e6z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367960/normal_5ff8701885b5d.pdfIn PDF document text
    • http://lexibanoma.iblogger.org/baby_gate_with_door_amazon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419644/normal_5fceb49ade23d.pdfIn PDF document text
    • http://zobebukore.22web.org/84603153943.pdfIn PDF document text
    • http://cheapestshop.xyz/what_is_the_most_popular_winter_sport_in_canadac7rbn.pdfIn PDF document text
    • http://bestcreditcheck.info/85594360380sq6wn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473651/normal_6019248d7abaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428052/normal_6032dc91b5c20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426682/normal_5ff00618daea7.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/sefukirexuwekij/nopavogogegevetiri.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/11498804061.pdfIn PDF document text
    • https://369206df-e466-4f8f-9771-850d1edb33c5.filesusr.com/ugd/8fd5dc_cc236ad463934e5fab2aa25875d7f980.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/begijufadi/crystal_report_using_dataset_in_c._net.pdfIn PDF document text
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_a90a617ccbb547e6b4f6414321470e64.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/epic_7_skill_enhance_guide.pdfIn PDF document text
    • http://rurebirafana.epizy.com/zidedakeliwavaxikutixuxax.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/89911984622.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/hardened_crossword_puzzle_answer.pdfIn PDF document text
    • http://nujipuluz.epizy.com/xotamameneje.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/what_is_blood_of_elves_about.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/music_theory_for_dummies_amazon.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 5416 bytes
SHA-256: 49e2fa911163a3d57c658f4ebafcb273fe50199392ae677d5423c76a9e3b4118
font_01_sfnt_off000124ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124ED 10800 bytes
SHA-256: d41de500a2984947d60e423f9525116bf855897b5a78cd9a4d7c1d1163825105

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