Malicious PDF — malware analysis report

Static analysis result for SHA-256 874bc17f17825777…

MALICIOUS

PDF

81.7 KB Created: 2021-01-17 14:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 36104967b1891795f2dfb7ad9b199449 SHA-1: 2178488ba8980a72343d4e6835ea5c1bad1add7c SHA-256: 874bc17f178257770f0484545d2fce3c4d374d4432e88145490f5ef614aa8805
252 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable hosting or known malicious redirectors, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation or credential harvesting.

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
  • 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.
  • 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.
  • 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
  • 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://ggtraff.ru/aws?utm_term=b%2526+w+formation+audio+streamer In PDF document text
    • https://site-1257259.mozfiles.com/files/1257259/draw_something_gold_level_answers_dream_jobs.pdfIn PDF document text
    • https://gojefofowuf.weebly.com/uploads/1/3/4/5/134596001/wikonugexojogaxanagi.pdfIn PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/wibE2hf/61656013448.pdfIn PDF document text
    • https://vatalinonabalix.weebly.com/uploads/1/3/4/2/134234662/8786313.pdfIn PDF document text
    • https://site-1244768.mozfiles.com/files/1244768/6261825866.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/4biinji/6149999202.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/05e80ae26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f870fd8ea46b.pdfIn PDF document text
    • https://site-1172519.mozfiles.com/files/1172519/82756684829.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419828/normal_5feb607b1f79c.pdfIn PDF document text
    • https://cdn.sqhk.co/daribugubive/gggjgdZ/95410937666.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/YjjThg5/pacific_beach_fire_department.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/21194616768.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/lijotatabefumuravujanofan.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/wepatavitejijikegogip.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_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 4204 bytes
SHA-256: 7cf575607da54c2e899210e1a7d1d1c95a28386f77ec91af25f8652f20213cd2
font_01_sfnt_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 10780 bytes
SHA-256: d89f3379db0748bd28f2af79f8c37c7cf958afa99633f8f34b2dfb57e2e3670a

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