Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca4a31839068ba7…

MALICIOUS

PDF

78.3 KB Created: 2021-03-16 18:57:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d31174ba1f910636d00c93b69b4cd9c0 SHA-1: 0df12046e9ca5045c6bb02b5e898be387741bafd SHA-256: aca4a31839068ba783ba24c3ce9e56d8285924b08cfc5691df1bde0209af9e9a
196 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 point to SEO-optimized PDF files hosted on suspicious domains, indicating a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly suggest this is a malicious SEO-driven phishing campaign. The presence of ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://golowaki.ru/award?keyword=i+love+pdf+doc+to+pdf PDF link annotation
    • http://comforfemj.fun/upgrading_and_repairing_pcs_21st_editionwq1j7.pdfIn PDF document text
    • http://fasad-dom.site/skyblock_map_mcpe_1._16._29gotw.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/78420144868.pdfIn PDF document text
    • https://xivexibajewubud.weebly.com/uploads/1/3/1/0/131069970/c47cd06a8336ac6.pdfIn PDF document text
    • https://lolijejolo.weebly.com/uploads/1/3/4/4/134442146/digevajawa_sisovav.pdfIn PDF document text
    • https://vakikuxikedeti.weebly.com/uploads/1/3/5/3/135320305/kekasafonokiga.pdfIn PDF document text
    • http://zelumefepa.sportsontheweb.net/lejesix.pdfIn PDF document text
    • https://gevexivojuler.weebly.com/uploads/1/3/4/4/134444242/doguwuvifubasevafip.pdfIn PDF document text
    • https://gadujixefanupu.weebly.com/uploads/1/3/1/1/131163635/1007540.pdfIn PDF document text
    • http://lazerepil.site/sample_florida_home_inspection_report6xul7.pdfIn PDF document text
    • http://fitokapss.xyz/albert_pike_morals_and_dogmaqcyx8.pdfIn PDF document text
    • http://nat-yoga.space/ap_police_e_challan_appvi95b.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/xezonijida/hyrule_warriors_adventure_mode_map_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/didaribimujus.pdfIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_d912e20f788541c4ab1ff1a38e60f75c.pdf?index=trueIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_23292fe8ae1f45539e09cc1f5ff39c47.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/animation_in_android_studio_tutorial.pdfIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_8c1ce9bef9764c9e88676d0c95921a7c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/british_sports_channels_tv_guide.pdfIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_45972e1dc6c24b17adb418d66e0634cb.pdf?index=trueIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_70a5de6ccb414a80b3142306c0accc22.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gateme/84107514629.pdfIn PDF document text
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_82d9895620534fe494ca736416dfa26e.pdf?index=trueIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_f19745127618488f8b5cbe91f5be1b4a.pdf?index=trueIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_7e4db7c12f53436ab50d4da683ef1242.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 8292 bytes
SHA-256: 254b3cbab6f88f60d755db6033d81f36c623109e5baefd6c037b3e59c1bb7177
font_01_sfnt_off0000f629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 4664 bytes
SHA-256: c181571b3c76597fb7ddb7d283b3c4f3581b2a2a65acff87ec6c23b05efc725b
font_02_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 11044 bytes
SHA-256: b3146ba76df0c971931a6354e17f2e35c3483e37bcb30bbc719cedf5508182e8