Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c127447243a92a…

MALICIOUS

PDF

71.8 KB Created: 2021-04-01 01:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ca9e7b9a248737e27170e80914b99a74 SHA-1: d8311b0f9d845e3939a14ca373a9e6bdee7d0e14 SHA-256: a3c127447243a92a5d93e9228cdba836036aa20ccc39f2ae3909122f03bffb4c
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many of which point to potentially malicious or disposable domains, indicating a link farm designed for SEO manipulation or phishing. The presence of a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and the ML classifier's high score strongly suggest malicious intent. The document body, though corrupted, contains keywords like 'Sap basis tutorial for beginners pdf', which likely serves as a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://crophysi.ru/strik?utm_term=sap+basis+tutorial+for+beginners+pdf In PDF document text
    • http://masajsalonunuz.com/lilevidefefejubb2yqx.pdfIn PDF document text
    • http://usesol.xyz/obd2_mini_elm327_wifi_interface_adapterknchz.pdfIn PDF document text
    • http://my-favshopc.online/quantifiers_grammar_worksheetkcqwl.pdfIn PDF document text
    • http://hardcreditcheck.info/fitotidufavekuvusalirst7sq.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/95387212034nof7m.pdfIn PDF document text
    • http://sravniproxy.info/93741321962s2ian.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_efb00afa0dcb444cba7084c65a3f6d90.pdf?index=trueIn PDF document text
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_4c2f7b926b0d45718ddcb01e519449e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sepawi/mibiwegumizajunuzoge.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/battlelog_web_plugins.pdfIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_d1c086af4b71493ea1047514292ea7df.pdf?index=trueIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_995661cec6174941a874045a912625d4.pdf?index=trueIn PDF document text
    • https://018ae6bf-5b6e-4bf7-bb5f-89503284f855.filesusr.com/ugd/b7931c_c620bee0462f4908837901549ece3d78.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolina/mevefojemenub.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_d9d924ac7b3d4b2abb35e78e6a0ff687.pdf?index=trueIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_dc563276d96d4fdcb65b2e46080c9c59.pdf?index=trueIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_d87d0d7b14f24661a1c8f0dfea9487f7.pdf?index=trueIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_b00daacded9a41a6ac799de78605c850.pdf?index=trueIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_88269249bf2e410ea70ab4fe43de8126.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/62741783540.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_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 5452 bytes
SHA-256: 186c4da8daab55851b01a9fed153d47305881c6e16c7dd681c1cfaf1ea2a2cd4
font_01_sfnt_off0000eba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA2 10736 bytes
SHA-256: b4e00a1c71c8420183056781aaf655dd2ee2a048a6c339233753a775553624fa

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