Malicious PDF — malware analysis report

Static analysis result for SHA-256 15836b04bc25c9bb…

MALICIOUS

PDF

78.2 KB Created: 2021-03-20 07:42:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b766af9564a0f7600956662e2ae7dd5 SHA-1: 790b61a0b0463a36544f513ce427c65c0f7a3961 SHA-256: 15836b04bc25c9bb2f6ae08df45cb885af785fa4fc619a6e2fb268b271b5dff0
156 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 phishing or trojan payload. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, likely to manipulate search engine results or host malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or content-luring attack vector, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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/wix?keyword=blue+snowball+pop+screen
    • https://cdn.sqhk.co/forosobeg/ubiayic/chocobo_racing_guide_ff13-_2.pdf
    • https://joposiga.weebly.com/uploads/1/3/5/3/135399072/nufutafosixutafu.pdf
    • https://xaliwituxezaxe.weebly.com/uploads/1/3/5/3/135323019/4c3d67f1f5a57a7.pdf
    • https://cdn.sqhk.co/xaranoraf/yH6Cid1/65713016465.pdf
    • https://bofeliwibetu.weebly.com/uploads/1/3/2/8/132814086/9429000.pdf
    • https://limulepaxot.weebly.com/uploads/1/3/1/3/131379958/towulavijej.pdf
    • https://kapovisawok.weebly.com/uploads/1/3/4/6/134652754/469564fe95f586.pdf
    • https://gagebenejiv.weebly.com/uploads/1/3/0/7/130740087/d9135afb1aa.pdf
    • http://vevebopawo.mywebcommunity.org/78696472868.pdf
    • https://cdn.sqhk.co/woxekivepi/0LDhhej/maze_rattan_kingston_grey.pdf
    • http://vofufime.mypressonline.com/99568412567.pdf
    • https://cdn.sqhk.co/kusedesomawa/ifYgjUg/426_namahana_st_honolulu_hi_96815.pdf
    • https://cdn.sqhk.co/kexofodatop/8JhhDgd/97027998379.pdf
    • https://cdn.sqhk.co/derixosu/cheGi5l/zombie_frontier_3_gift_code_android_2020.pdf
    • https://bazeneta.weebly.com/uploads/1/3/0/8/130813787/9625193.pdf
    • http://mobeditobaxul.scienceontheweb.net/boolean_algebra_and_switching_circuits.pdf
    • https://cdn.sqhk.co/wexifidobafo/PgjgcoT/16356123189.pdf
    • https://cdn.sqhk.co/jirudumom/ahc3hil/that_thing_you_do_chords.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ba3b953d-19b1-4a98-b22c-70e5a22ffc99/how_to_read_ebook_on_ipad.pdf
    • https://uploads.strikinglycdn.com/files/de4cfa80-c1e6-43c9-867d-2985fe090b01/phrasal_verbs_in_english_with_meaning.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_off0000f2c9.bin
53daefa1dbfbdefc02da3829bbc3005faa865f3a9ef2c07c14cdae8391e5db93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 5208 bytes
font_01_sfnt_off0001049d.bin
cddff0bc48e0f2ab7843571dac91baf7f3d6cdb535f0cfe368519492608d7aca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 11116 bytes

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