Malicious PDF — malware analysis report

Static analysis result for SHA-256 f212c8aab8719217…

MALICIOUS

PDF

78.6 KB Created: 2021-05-10 20:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a15a6290a94a5b7405adad3fcf55a51 SHA-1: 7d0eda9afbd1502fc42552ab6a737a9cc646d8d8 SHA-256: f212c8aab8719217f8e18f7fb9dcc6f1826c5664c593c18740aced921c9d4f71
186 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The presence of a URL with a 'utm_term' parameter suggests a tracking mechanism for a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=used+john+deere+gx345+hood+for+sale
    • https://dilasakezonaxos.weebly.com/uploads/1/3/0/7/130775260/9165089.pdf
    • https://girenofozajete.weebly.com/uploads/1/3/4/4/134476001/ee5c15a6.pdf
    • https://cdn-cms.f-static.net/uploads/4409840/normal_605c8639d2463.pdf
    • https://limosajabug.weebly.com/uploads/1/3/0/9/130969130/3124785.pdf
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/e3e1c0d.pdf
    • https://cdn-cms.f-static.net/uploads/4422912/normal_604d8b0116750.pdf
    • http://zipogagu.iblogger.org/yamaha_rx_v573_manual.pdf
    • https://static.s123-cdn-static.com/uploads/4486356/normal_6003f61746a63.pdf
    • https://cdn-cms.f-static.net/uploads/4480403/normal_5fdb927f399b9.pdf
    • http://diwokaxojizo.iblogger.org/12110047655.pdf
    • https://vobikonim.weebly.com/uploads/1/3/5/3/135390296/maginavafonefuvozel.pdf
    • https://xugugizebe.weebly.com/uploads/1/3/1/4/131482894/jexodo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/19237885-a0fb-4899-ba76-63cd200baee9/pray_to_god_i_can_make_it_back_home.pdf
    • https://uploads.strikinglycdn.com/files/1394bdf5-fadd-4350-86a9-862880c6c0ee/56522836402.pdf
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_92b0033f9b7d48e1ba3a00ea339fbe0a.pdf?index=true
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_ec74431cd9884c2fba0bc416c05d2432.pdf?index=true
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_29edb901583c4c69bf39d6d9a4cb8255.pdf?index=true
    • https://2d66045e-c276-4037-81df-184b25840e97.filesusr.com/ugd/cdf3e3_17ed7625dd3c45beb96f61ece1e11e1f.pdf?index=true
    • http://jalasofumikom.rf.gd/gepeninunufowariw.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_off0000f2e6.bin
b9fe058521ab7b2e62f3324dc81e506a333893f2acf00f3dbed7404ad0701bd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 5680 bytes
font_01_sfnt_off0001064d.bin
00ed61e78fd516044e64b219e76e0c28a05e36df17020ba5ba09a0bc70dab92e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1064D 11304 bytes

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