Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37c655e1d3072d2…

MALICIOUS

PDF

133.8 KB Created: 2021-03-28 13:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ac2743e05823d926f1313b56532b907 SHA-1: d108e0a9595c7bb6e365f4913e369efa6fc34bac SHA-256: a37c655e1d3072d208d5f63fa221dc1aedd2f0db4989b8e3ae72635ee198872e
104 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The embedded URL points to a suspicious domain, and the document body contains language suggesting urgency, which is a common social engineering tactic. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the presence of external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/123?utm_term=battery+doctor+android+app+free
    • https://cdn.sqhk.co/suvotoruwot/jcjdPhi/4218305534.pdf
    • https://cdn.sqhk.co/puxolika/fBficgf/dojabimisisoberumenew.pdf
    • https://cdn.sqhk.co/mufipofunup/FFhbieT/coordinating_conjunction_worksheet_grade_8.pdf
    • http://wogavuxemadirof.iblogger.org/danasilub.pdf
    • https://cdn.sqhk.co/kerodamajop/h9D8eNm/awl_words.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7322f44d-5cb7-45f5-8521-a79093f6ce74.filesusr.com/ugd/dd0890_657a4455c5964b3b80fe3d42c75acd69.pdf?index=true
    • http://ralepixevoz.epizy.com/68669201130.pdf
    • https://65f7c47b-6fa2-4aed-9649-637438a88329.filesusr.com/ugd/8fb471_2506b8c0588c45a7be3bc1b3e61e94eb.pdf?index=true
    • https://s3.amazonaws.com/mupukesunobaga/69722534379.pdf
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_5541259dc58d4fa985d8fdcbf200227c.pdf?index=true
    • https://s3.amazonaws.com/zamuriza/nanitosenolexaxudu.pdf
    • http://wujuxupizosafe.rf.gd/game_templates_unity3d.pdf
    • https://s3.amazonaws.com/futamo/dell_vostro_1500_laptop_not_starting.pdf
    • http://lotidasifiteg.epizy.com/34142522964.pdf
    • http://tosebimujuted.epizy.com/advice_letter_format_sample.pdf
    • https://s3.amazonaws.com/ritoma/zakijapimoduxemakix.pdf
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_c9adc958c48e42bf85056b4939ac4e9a.pdf?index=true
    • http://zetazuzetebutef.epizy.com/xukesoxosojofobilitu.pdf
    • https://s3.amazonaws.com/goviwigax/aznavour_autobiographie_reportage.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_off0001d277.bin
bc5dfc09d91861ae2dd4af9c1caa18fbf9aed66be78e09c0234f84c1a4c2ea93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D277 5088 bytes
font_01_sfnt_off0001e3e4.bin
eb10bc40b023ce9cc2fb33dba9e0355d0785eebebda3adef14ed36d94a7abd33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3E4 11340 bytes

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