Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfaaa8b57ef0b8b9…

MALICIOUS

PDF

73.7 KB Created: 2021-04-19 11:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19a4e631d5aff6dc9bb9b077c2e0c510 SHA-1: 1f2e8d2678051e19463080e9212b26d9b66a964c SHA-256: dfaaa8b57ef0b8b9bfbe5bc524631af6e874fd4a483c51d09369c9c0b94c9cb6
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to drive traffic to potentially malicious sites. The document body, though partially corrupted, contains text related to handling ADHD, which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://midufefew.ru/strik?utm_term=how+to+handle+a+child+with+adhd+and+odd
    • https://futisukafasuku.weebly.com/uploads/1/3/5/3/135345320/f3db5cabcf899.pdf
    • https://xuxewisi.weebly.com/uploads/1/3/4/2/134235501/789ce8194405ea.pdf
    • https://cdn.sqhk.co/gulizate/bqhjauw/lafokelegupojawixabiwava.pdf
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/db86ca01f8.pdf
    • https://cdn.sqhk.co/godereliku/Licoghv/rumble_fish_chapter_5_summary.pdf
    • http://frut-tree.site/gupoziperirisojofihalnp.pdf
    • https://dunogijejuj.weebly.com/uploads/1/3/0/8/130813547/pabuderukadon.pdf
    • https://bipipabogudas.weebly.com/uploads/1/3/1/1/131164499/2432360.pdf
    • https://piwifagipob.weebly.com/uploads/1/3/1/3/131379899/koxifefa_jafabupojati.pdf
    • https://jazigibebegada.weebly.com/uploads/1/3/1/6/131606339/dosum.pdf
    • https://ronenajawewaxiw.weebly.com/uploads/1/3/4/5/134594127/4856167.pdf
    • https://xirozakopep.weebly.com/uploads/1/3/4/7/134719339/f22b3af2f4f317.pdf
    • https://lekaretuzej.weebly.com/uploads/1/3/0/7/130738752/jepafimep.pdf
    • https://bixikobitil.weebly.com/uploads/1/3/4/5/134525497/vafujerukewil.pdf
    • https://tugunopoxakisif.weebly.com/uploads/1/3/1/3/131398472/pibusup.pdf
    • http://fishland.store/634505756191pr3k.pdf
    • https://tiwudusakuwizir.weebly.com/uploads/1/3/1/6/131637104/7463e6b42c4a5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wuwokumafinu.epizy.com/gre_verbal_practice_test.pdf
    • http://tidalar.rf.gd/bright_minds_memory_rescue_book.pdf
    • http://bobigake.rf.gd/where_the_wild_things_are_best_quotes.pdf
    • http://xibupafuvobiluk.rf.gd/dorewinemokusodo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d0.bin
ab282fc379b50f924d5d70dd70a5bb43397df8b6c9be846f33ea7ae4a69fbb64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D0 4808 bytes
font_01_sfnt_off0000f738.bin
85ee57cc62f94a241dcaafd1f6947d1765dacb20c25947dd6b005c60ca8e54a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 10032 bytes

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