Malicious PDF — malware analysis report

Static analysis result for SHA-256 087921df451e365a…

MALICIOUS

PDF

72.2 KB Created: 2021-03-24 22:16:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93763e92e719480af9bf9b4a3caae0b9 SHA-1: 7b52c169c93da7934697cf6315f4edcb8d5140a2 SHA-256: 087921df451e365a97a8e7756f4f53d2119261a3c8f6d69b5f8c0e9958146bca
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 high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs point towards an attempt to redirect users to potentially harmful websites.

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://xezojetit.ru/wix?keyword=tweet+smoking+cigarettes+lyrics
    • http://buxizofi.22web.org/libro_sagrado_del_hinduismo.pdf
    • https://jonimewogil.weebly.com/uploads/1/3/1/8/131860125/pujajupamu.pdf
    • https://static.s123-cdn-static.com/uploads/4497658/normal_5fe39574a4aa5.pdf
    • https://cdn-cms.f-static.net/uploads/4445325/normal_60113ed9a02fd.pdf
    • https://cdn.sqhk.co/wadupaxi/hbge0xr/92701914135.pdf
    • https://cdn.sqhk.co/mafozerekat/gjhoKgh/underground_street_racing_car_mod_apk_unlimited_money.pdf
    • http://pigaxugopaxazuz.22web.org/assistive_touch_for_android_apk.pdf
    • https://luvisusarav.weebly.com/uploads/1/3/6/0/136011852/b9a4f.pdf
    • https://cdn.sqhk.co/nozelenid/gPV8GPY/monster_warlord_evolution_guide.pdf
    • https://ravodesukifalav.weebly.com/uploads/1/3/1/1/131163780/josotonosojosazute.pdf
    • https://cdn.sqhk.co/sabimejuka/hbhgbwr/buremitivaputonuke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7f3d6530-f2e9-4e49-835f-8e12830ea8c0/xowunatitenezimiz.pdf
    • https://uploads.strikinglycdn.com/files/b8c615a0-87b5-45d6-a597-cb6ad4289975/the_electric_state_wiki.pdf
    • https://uploads.strikinglycdn.com/files/62986522-d335-4f2a-a8a5-37200f7eeefb/69782702711.pdf
    • https://uploads.strikinglycdn.com/files/a971fb32-2183-46fa-a424-9d59193955b7/stihl_ms_170_parts_list.pdf
    • https://uploads.strikinglycdn.com/files/29cc0a7d-ac93-4ada-9eef-936740a29813/maytag_centennial_dryer_not_hot.pdf
    • http://tumezubix.epizy.com/90077827915.pdf
    • http://mevusajilitum.rf.gd/sepepamuregabita.pdf
    • http://xugadizedema.rf.gd/end_of_the_affair_lyrics_ben_howard_meaning.pdf
    • https://uploads.strikinglycdn.com/files/d2456ec2-1bf3-413e-993e-1f903da442ad/41628790331.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_off0000dd9a.bin
9ffc8e2fcdf8c52a137f9624c4aeb8c03c1b13ed6b13d2160aa03bce8f6539f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 5328 bytes
font_01_sfnt_off0000efbe.bin
128876dd8bb1e2a1cfed475260a411acf059788b025b3024a8e54f46ba4f5eab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 10580 bytes

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