Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c50d37df15feb2d…

MALICIOUS

PDF

76.2 KB Created: 2021-03-03 09:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e834a9fc80c0acefb1d592a76b9dacda SHA-1: a64fb3b3e46c18251b22e2194cfec16a12b496fb SHA-256: 3c50d37df15feb2d52b459ebef4d9ba6ccf5894463a7f6c30bb7a8ad5cc263d0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1190 Exploit Public-Facing Application

The PDF contains a large number of external links, many of which point to potentially malicious content, and is flagged by ClamAV as a phishing trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document likely attempts to trick users into calling a phone number, a common tactic in tech support scams or phishing operations. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nipisod.ru/123?utm_term=night+owl+security+camera+app+for+iphone PDF link annotation
    • https://cdn.sqhk.co/zoluxoni/6b9hj3Z/dumelesejavabanube.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/UD2ic15/movie_poster_creator_online.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/jf5Hjb9/39318548633.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/40187791044.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/79350146787.pdfIn PDF document text
    • https://cdn.sqhk.co/kasesiseb/giicphj/mad_dragon_defence_mod_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/jesjjbd/jinupategurefiz.pdfIn PDF document text
    • http://wabiferofuvud.mygamesonline.org/bamoratalurazibajipe.pdfIn PDF document text
    • https://witabavuwimob.weebly.com/uploads/1/3/4/3/134339013/4837190.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xurosuforudev.atwebpages.com/gedijomosekoposege.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/you_are_the_reason_lirik_video.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 5592 bytes
SHA-256: 3cada49ad334a993aece25e39a3dd3d1a3b3118d64dc0abaad7407ac5c9dd139
font_01_sfnt_off0000ffcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCB 10424 bytes
SHA-256: 5d5b710511cc9f6b5a6adc93460c32da83648977a6f160a63cfadaeca4e9ee01

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