Malicious PDF — malware analysis report

Static analysis result for SHA-256 a520135e1addde2b…

MALICIOUS

PDF

74.0 KB Created: 2021-03-21 08:13:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42b1e444dca4ecb5ffd5dd8389a86e29 SHA-1: 7c169abf3fe58290d4be3620839fb69e53ecbba1 SHA-256: a520135e1addde2bce04d9bf94664d0bf004794877400f12186b99fcb7ede687
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and other free hosting services, characteristic of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate maliciousness. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=how+to+use+a+convection+oven+microwave+combo
    • https://gijejutet.weebly.com/uploads/1/3/5/9/135974865/2198d7.pdf
    • https://cdn-cms.f-static.net/uploads/4366401/normal_601259924cf94.pdf
    • https://cdn.sqhk.co/depivuni/dOVmpGk/top_hits_of_the_50s_and_60s_youtube.pdf
    • https://cdn-cms.f-static.net/uploads/4500425/normal_6056c6ad23f05.pdf
    • https://static.s123-cdn-static.com/uploads/4476001/normal_5fcedfce75fdd.pdf
    • https://tazumeter.weebly.com/uploads/1/3/1/4/131438167/xikovutevirorinogip.pdf
    • https://vidiwubiref.weebly.com/uploads/1/3/0/8/130874646/9fd63074baf2.pdf
    • https://cdn-cms.f-static.net/uploads/4368969/normal_6026511bc0a5b.pdf
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/zaluwo-lagiwazu.pdf
    • http://fufivepibagat.iblogger.org/bsplayer_android_subtitles_location.pdf
    • https://cdn.sqhk.co/zolilobup/XhgQ8Eo/supegugomuwirexofinekafu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jopomodilamego/lekerapil.pdf
    • https://s3.amazonaws.com/xidazeze/zijig.pdf
    • https://s3.amazonaws.com/dudurat/59018584605.pdf
    • http://zowolowoziru.rf.gd/united_states_map_with_state_names.pdf
    • http://vodugesivizere.epizy.com/9285616526.pdf
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_d24ba04c525d49c3be300440d94559e2.pdf?index=true
    • https://s3.amazonaws.com/jivuxo/19869464161.pdf
    • https://s3.amazonaws.com/jiguwuzobozobaz/tiger_census_2019_india_report.pdf
    • https://17500468-634e-4f48-81ad-48a4a068d6fa.filesusr.com/ugd/dcac76_ad923c07bb424e44ab3e626348a2866d.pdf?index=true
    • 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_off0000e43a.bin
4fa5973c3e4b36298a2168345262213c2a9ff7ed44f733d2bbe66440e988fe0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 5168 bytes
font_01_sfnt_off0000f5cc.bin
894035fe1e80c1373c4ff036088c613c5bafbb7bae7bac8f81cb778a5cee343f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 11260 bytes

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