Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7838fe3768cb66b…

MALICIOUS

PDF

74.5 KB Created: 2020-12-27 04:04:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cce7cb7fcff7bda8bbd6b29da1ae9f10 SHA-1: 167cca71f9ecd7834da18bf1c71921958ee23973 SHA-256: b7838fe3768cb66baed0e3fff0606e79c8de6a3ad2da44677241923f2487c748
154 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, and the presence of 'utm_term' parameters suggests tracking for phishing campaigns. Although no scripts were extracted, the overall structure and heuristic firings strongly suggest a phishing attack leveraging a lure related to Amazon Prime recharge plans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffnew.ru/strik?utm_term=amazon+prime+recharge+plans+jio PDF link annotation
    • https://cdn.sqhk.co/zijikunu/gd1jjY0/vosor.pdfIn PDF document text
    • https://reninifovebomul.weebly.com/uploads/1/3/4/3/134361606/3311243.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/559f3.pdfIn PDF document text
    • https://cdn.sqhk.co/pajugeluj/SezGXFa/lyrical_video_maker._ly_video_status_maker_2020.pdfIn PDF document text
    • https://pobafegesodagiz.weebly.com/uploads/1/3/4/3/134305133/vaforow.pdfIn PDF document text
    • https://palarijebatexo.weebly.com/uploads/1/3/4/3/134338538/27d44898411ea55.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/kuximub_potagof_tobopedofowabos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a71ca286-45e9-4568-8106-eb8b6db90eb7/33917195531.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/lm339_comparator_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/463586c4-6018-4474-b247-c430f4527752/60951929570.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/24519221209.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/43101612953.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/27417493323.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/baroladoxutakuxusune.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/aplanadora_manual_de_tierra.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_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 5460 bytes
SHA-256: b484a2e17358f8676be2d84b5d562f1826e29cdfb3588315aec289effa130c6b
font_01_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 10968 bytes
SHA-256: ab3518f7d8b4b2b840a1e882530dd3c675aed3b99c52edba6fb0f4f46a0c005c

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