Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca14c1a0f1ec9fa…

MALICIOUS

PDF

61.9 KB Created: 2020-12-26 09:06:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1aeda747e1c5351fca48608ec2c508b SHA-1: dfa88e872ed5b112603c3fceb46973a4a3b54cdc SHA-256: fca14c1a0f1ec9fac331b6e398f8fd2f41f9e541f7f311e4fdb68b7e8ebd76dc
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The heuristic firings indicate this is a malicious redirector and a link farm, suggesting the primary purpose is to drive traffic to malicious sites. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection as Pdf.Phishing.Trojan strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://cctraff.ru/aws?utm_term=escala+sara+ataxia+portugues+pdf
    • https://cdn.sqhk.co/gagufatemo/Hjfn8jg/traffic_road_signs_meaning.pdf
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5f96bde02864f.pdf
    • https://cdn-cms.f-static.net/uploads/4368501/normal_5f96c61901eee.pdf
    • https://cdn.sqhk.co/fawabanof/4gciaje/38526326659.pdf
    • https://rewemaxokaw.weebly.com/uploads/1/3/4/7/134748572/sanoliwowepon.pdf
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/37b38e982360.pdf
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/8432854.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/35f89ac6-8453-4c6f-ae99-57bc27b24adb/verilevumiboma.pdf
    • https://uploads.strikinglycdn.com/files/ad44361c-d23c-44ff-bc1f-4b674269fe60/52613568533.pdf
    • https://uploads.strikinglycdn.com/files/b85686d4-e724-4398-8185-2e574a767013/xawirokidapujojalidano.pdf
    • https://uploads.strikinglycdn.com/files/b80d579d-cea9-42ca-b71a-6fa5da72dd9f/joystick_pokemon_go_ios_free.pdf
    • https://uploads.strikinglycdn.com/files/040f22ff-33bd-4891-b1fd-20daa0b2f918/rca_rtu6549_review.pdf
    • https://uploads.strikinglycdn.com/files/cd6a3168-e51d-4782-ac51-28ea87ccb0ae/poxibibopuxuvido.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_off0000b63d.bin
bd1fc0b11ec4b8605fb27b5dfef77b114fbb9db5fd21df728d444708c0618a98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB63D 5348 bytes
font_01_sfnt_off0000c885.bin
155dd3b1b4b98e4da868ed607bda5e423df1124e59413e51ff52018b3476b35c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC885 10188 bytes

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