Malicious PDF — malware analysis report

Static analysis result for SHA-256 072b9ade273d32fa…

MALICIOUS

PDF

76.2 KB Created: 2021-03-23 03:24:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 487c8cacbb1ae542a84c6f9ec111b0af SHA-1: d29a660cf83e1ad1c39563fce29b20026aa84596 SHA-256: 072b9ade273d32fa4454be34b586331723d244e5af25b04bcff45098797606c8
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external URIs pointing to potentially malicious domains. The presence of a large number of external links, including those on disposable hosting, strongly suggests an attempt to redirect users to phishing or malware-hosting sites. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/strik?utm_term=public+relations+graduate+programs+worldwide PDF link annotation
    • https://cdn.sqhk.co/runetonorox/igi8Bjj/kideseruzewujufet.pdfIn PDF document text
    • https://cdn.sqhk.co/toxaxiked/HUjejeD/67092073844.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/jFpTifY/amoeba_sisters_cell_specialization_worksheet.pdfIn PDF document text
    • https://nobaloledajasom.weebly.com/uploads/1/3/2/6/132681012/3355018.pdfIn PDF document text
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/pirepavutadexoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxifopu/ennSrVO/bazuz.pdfIn PDF document text
    • https://lopekemin.weebly.com/uploads/1/3/4/6/134628767/murawurud.pdfIn PDF document text
    • http://keziwir.iblogger.org/22366530039.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/jjdlYjZ/12549146603.pdfIn PDF document text
    • https://jedinelig.weebly.com/uploads/1/3/5/9/135982929/b44186.pdfIn PDF document text
    • https://cdn.sqhk.co/xiruregexibe/fidSic3/25796020761.pdfIn PDF document text
    • http://rufopaf.22web.org/22919267850.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/dghPBLe/beat_balls_the_magic_loop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_ab6c678e17b44fee92dd91d8f4251f15.pdf?index=trueIn PDF document text
    • http://sijelufuzarolup.epizy.com/fevofodilironadur.pdfIn PDF document text
    • http://laburebimefifal.epizy.com/dnd_monsters_by_cr.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_d6b2415c1bbd4883bab69b9ff1ca1035.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_96212d518e0b41bfbcce9937d64a47c7.pdf?index=trueIn PDF document text
    • http://sadamenukovizep.epizy.com/miss_u_songs_in_tamil.pdfIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_2c2256195b174946beaad1bc42cf2446.pdf?index=trueIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_df644d1132574eb9bae7ad463418ac5a.pdf?index=trueIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_74cd5e4613fa41fb9369b5e79c114a71.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_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 5508 bytes
SHA-256: 254d3086fd229cc037cd2e93685ca065875d5e01112166ada0c7b5f56973a46b
font_01_sfnt_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 10072 bytes
SHA-256: 72962c3b9d370628f738b6cf37fab76d11e48bbf1d77efca3b10e7984655c368
font_02_sfnt_off000114fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3