Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb5f87a6f8d3abd…

MALICIOUS

PDF

72.7 KB Created: 2021-01-03 18:32:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2fc5cd3ef1674df9f1e2206d844db57f SHA-1: 57832bb7c35e42bf96e30f5e1df2377e403c14bf SHA-256: dbb5f87a6f8d3abdb978829d50aa10251176f200c7b8105bbb785a5423f37a39
206 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'job corps lewiston maine', indicating a lure to attract users. The presence of ClamAV detection and ML classification further supports its malicious nature, likely serving as a phishing lure or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://trafffe.ru/123?utm_term=job+corps+lewiston+maine PDF link annotation
    • https://cdn.sqhk.co/lejukujegomi/B86Bngh/free_pool_games_online_single_player.pdfIn PDF document text
    • https://cdn.sqhk.co/bilejufikone/joiflid/beautiful_wallpapers_for_computer_free_download.pdfIn PDF document text
    • https://vebajixumese.weebly.com/uploads/1/3/4/4/134483039/bunorobom.pdfIn PDF document text
    • https://cdn.sqhk.co/defegitip/aiihghi/doublex_casino_free_slots.pdfIn PDF document text
    • https://sulewana.weebly.com/uploads/1/3/4/6/134605909/5df1aa9f8ffe.pdfIn PDF document text
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/7985896.pdfIn PDF document text
    • https://toromadon.weebly.com/uploads/1/3/4/5/134523466/nakito-rekudosixikavi-lusejaxovamon.pdfIn PDF document text
    • https://mibarepazakeme.weebly.com/uploads/1/3/4/6/134685426/1fa5acd.pdfIn PDF document text
    • https://wapawovukeped.weebly.com/uploads/1/3/5/3/135333371/siwawevaxekuna.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/fajonubinomeder/18138940104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b53c47f-302c-44c1-88da-20d775dae4e0/mufefidixalufiwidexup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b1a1b4f-abf5-4e35-a702-ebc17d117d23/xujenevelorel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b64f5c-9a64-42ba-af5f-5428119d0ad0/xikosenirozefuk.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_off0000e036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 5300 bytes
SHA-256: 162327b49fc9d755b11a89c655a8411ac93f3f9da71cf197231e588df3ab9fe0
font_01_sfnt_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 10616 bytes
SHA-256: a8ff77fe3debb45f4132fc0be7a27c0eb23a415cd25c5d03a8e43dc1e34fe6ca

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