Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa94379875c47f46…

MALICIOUS

PDF

76.3 KB Created: 2021-03-19 22:12:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5b17062884d4dc43e401af2ce3e04ed9 SHA-1: fc29fd9593fd294c626a54b1dc497b119774f647 SHA-256: aa94379875c47f464426c16b44cb9fbd3ac767c9f9c96609efbe6bc5be07a7c9
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

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://ponafet.ru/wix?keyword=covalent+bonds+worksheet+answers PDF link annotation
    • http://wifejopoxakobo.iblogger.org/govinaximepivusolowemunop.pdfIn PDF document text
    • https://cdn.sqhk.co/viposaxa/jjgjLja/ivar_the_boneless_death_in_real_life.pdfIn PDF document text
    • http://lenafitokid.iblogger.org/24667858560.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/hgiiWCK/stickman_fight_battle_shadow_warriors_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pemiduwegam/QIxifgd/wuzemusu.pdfIn PDF document text
    • https://cdn.sqhk.co/nilofixogezu/jjIhehd/nemolilaguduxilipazufopib.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/NNjjjeZ/57136280672.pdfIn PDF document text
    • http://winsl.space/lord_of_the_rings_book_order_redditebhy4.pdfIn PDF document text
    • http://trylait.club/benzel_spine_surgery_4th_editionvps6j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc34ce6a-3e48-41e5-b18a-381d1c1bbbed/bepiwosexudozame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a1b957b-c2a2-4ef0-bc0d-f3235f34333e/directv_genie_model_hr54.pdfIn PDF document text
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_5ae2951a7ead40f191d82737b76ee034.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9cede21-6369-4ed5-bd07-afb4dcbcb1b0/genie_excelerator_learn_button_broken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3989cec1-0781-4411-b66a-6bb95c6c9d9a/how_efficient_are_fujitsu_mini_splits.pdfIn PDF document text
    • http://bunakakivukutus.epizy.com/kumano_kodo_self-_guided_walking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbad3f2e-6cbb-4721-9061-0d8eac8a83da/jubona.pdfIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_331103ba66184006850bf5135603761f.pdf?index=trueIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_c05c81cdd9f04f3dbaf0a331df43df17.pdf?index=trueIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_210c03c889bf4ecfab6943bb20253641.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcebf1ed-0727-47dd-a792-e569e8044ad3/cal_spa_hot_tub_filters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af225cef-180f-4316-898c-468e39fdd36c/21601403581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5938e434-f2e1-40d1-a3ac-1cb5b99f794a/wupagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c47b96c-c969-46d3-8e56-af0c795473fb/a_discovery_of_witches_season_2_episode_3_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/433a4649-aab2-42f6-a1a7-d3b802a4dfcd/migokavopesaxuminavivupik.pdfIn PDF document text
    • http://nudewewupapu.epizy.com/download_driver_hp_laserjet_p1006_windows_10_64_bit.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_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 5172 bytes
SHA-256: 5b69017b7a9b6797d20db7b092212a659cb5b92752f6843fb3a71154ae5bec62
font_01_sfnt_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 9788 bytes
SHA-256: 7d8e7fcd418b659d7398f007815274a03a3edf03d404352ddb28b55111967a46