Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ff5eeba03d60b8…

MALICIOUS

PDF

77.1 KB Created: 2021-04-24 09:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 77b5381028fe115124a1726575842c84 SHA-1: d4612a12d54aa3c60cceb38716736c2ee4cf484d SHA-256: 19ff5eeba03d60b8f22f7a4ed1b20b69cae67e8d3f18aa6432ec6fd24897c1d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO spam campaign. One critical heuristic identified a mass external PDF link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=how+to+write+1100+amount+in+words PDF link annotation
    • https://cdn.sqhk.co/nejajevafode/jz8geij/birthday_cake_recipe_not_chocolate.pdfIn PDF document text
    • https://cdn.sqhk.co/xolafunodo/LYhj2ib/vifaruzajogijumubunetoxub.pdfIn PDF document text
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/juwom_sizesebarabeli_logade.pdfIn PDF document text
    • https://cdn.sqhk.co/sofaxuleruri/hhgivoh/11946873639.pdfIn PDF document text
    • https://niromegezos.weebly.com/uploads/1/3/2/6/132681660/59eaae.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluniziwav/Kmii4jb/pazowugib.pdfIn PDF document text
    • https://xowedoditigivi.weebly.com/uploads/1/3/4/7/134714126/d3d9b173c0645.pdfIn PDF document text
    • https://funavekun.weebly.com/uploads/1/3/0/9/130969801/wukaderutez.pdfIn PDF document text
    • https://lerivifaladadov.weebly.com/uploads/1/3/4/3/134334847/mukezej.pdfIn PDF document text
    • https://xoxoxiwozolem.weebly.com/uploads/1/3/0/7/130739626/dedukexi_xofal_feweguwowuwu_lezimirowisa.pdfIn PDF document text
    • https://mijonogopo.weebly.com/uploads/1/3/5/3/135327524/549ab69b.pdfIn PDF document text
    • https://kenodijegubiv.weebly.com/uploads/1/3/4/5/134501598/duvibodipofaxa_lomalemej_papabumege_dazudisafojijis.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/vonuxagupeduze/play_catan_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a009d605-7662-4098-8d0f-faa4300d4831/ap_biology_chapter_1_introduction_themes_in_the_study_of_life.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/data_structures_in_java_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/legend_of_zelda_medley_trumpet.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/heart_failure_guidelines_sglt2.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/molecular_cell_biology_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b42f9ee3-890b-4dc2-8a5f-261c4080e39e/the_heart_of_darkness_darkest_dungeon.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/wreck_it_ralph_ios_game.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/which_prep_book_is_best_for_ap_chemistry.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/56609960823.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/nirexog.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_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 5188 bytes
SHA-256: 4a8c5fd74810343c442f728a7cdffdde54ee740eae90a94bf80ba37060386ef1
font_01_sfnt_off000102dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DC 10620 bytes
SHA-256: f970565dfb9df3855feccd63ad62f233ff1e8f9ec042595ab7a42bc916958e7d

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