Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a19d3fff2f6875…

MALICIOUS

PDF

92.4 KB Created: 2021-03-25 00:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 057a0ecb74f471a9ea4c4c5895863ffe SHA-1: 4d9272e46541c6bd2acdb1df5d15e23f8836a0f3 SHA-256: 05a19d3fff2f68757717064f2febaf51a6b2a9c60bf151bfd4ac419f6eedc7d3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://pelibifir.ru/wb?keyword=how%20to%20pair%20big%20blue%20unplugged PDF link annotation
    • https://nogudoge.weebly.com/uploads/1/3/4/0/134017621/2527894.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/turn_off_stability_control_jeep_jk.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/tabapibire-fipow.pdfIn PDF document text
    • https://zozabamefopofa.weebly.com/uploads/1/3/4/2/134234868/kofaj.pdfIn PDF document text
    • http://jomikifu.medianewsonline.com/55740886386.pdfIn PDF document text
    • https://jupiretuvivu.weebly.com/uploads/1/3/5/3/135383394/ee0366f.pdfIn PDF document text
    • https://zakekeru.weebly.com/uploads/1/3/4/5/134584110/4025687.pdfIn PDF document text
    • https://lamamamim.weebly.com/uploads/1/3/1/6/131606140/mazulanugukop-likabomixakepe-movejoguxim.pdfIn PDF document text
    • https://ronabamipiboti.weebly.com/uploads/1/3/4/5/134598089/3970380.pdfIn PDF document text
    • http://daxavepevepa.mypressonline.com/tosigob.pdfIn PDF document text
    • https://wemogejivaje.weebly.com/uploads/1/3/1/0/131070934/pobegowajav-tovedeloju-tusom.pdfIn PDF document text
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/jeramorixe.pdfIn PDF document text
    • https://sevozinevuzejok.weebly.com/uploads/1/3/4/9/134903388/zarixu-tomufagagopiv-buxafodazimod.pdfIn PDF document text
    • https://darenufu.weebly.com/uploads/1/3/1/4/131438483/3a348.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://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_99c5fbcf7f634f0d953e0c5f593ab825.pdf?index=trueIn PDF document text
    • http://jafixomedimun.onlinewebshop.net/magotafefur.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/71307905307.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/62758565399.pdfIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_15341a20a14844bcb6186ef8091c5e0e.pdf?index=trueIn PDF document text
    • https://f9cb7010-568c-45d0-b0a5-7bd630b60272.filesusr.com/ugd/b10ea2_016c873ee60b4d008d5620c7a75ec3d6.pdf?index=trueIn PDF document text
    • http://rususekobijo.myartsonline.com/delonghi_pinguino_4_in_1_portable_air_conditioner_14000_btu.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/i-_184_affidavit_of_support_form_instructions.pdfIn 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_off00011abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABF 5024 bytes
SHA-256: 1a4a32df3ab84c211ceda3af1f3853a97cce8ed57d5e268a18eb175b266adc73
font_01_sfnt_off00012be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE2 11984 bytes
SHA-256: bc610346d2c61b2385e723e7b1117a3b3a6bd36c010b6f980ecb0f55864bf2ae
font_02_sfnt_off000153f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F7 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230