Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11bab5f3af4a4fb…

MALICIOUS

PDF

124.7 KB Created: 2020-12-31 07:48:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a6683f0ce4097afb88efc0d3f4fafd7b SHA-1: 2b6ca824ed6fc3ed586e6d89b035f08fa2517bc7 SHA-256: b11bab5f3af4a4fb1014178fff6f97df835d535337b73312cd41662f848f3c8f
242 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically targeting a "free vip account login" lure. The presence of a malicious redirector link and the ML classifier's high confidence score indicate a phishing attempt. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing campaign designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=toomics+free+vip+account+login In PDF document text
    • https://gifetapajuloper.weebly.com/uploads/1/3/4/6/134682222/9818793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404966/normal_5f9890295fdbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5fb529f45405a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e8024900-cd44-4477-ace2-3fceb9137379/4513154732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c16b3c-bc04-4cc8-8cbd-9da56a0cd69f/98963093377.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38088085-19de-4ae5-ac8a-2dc450899564/7543454012.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/mac_mini_monitor_mount.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e54d0a01-dc9b-40d1-afeb-f3bd5bc5ce8b/changalas_pumpkin_patch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f9b6c39-9505-44d5-b623-1047d59745bf/reborn_baby_boy_dolls_cheap.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/jolelegeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88d7741-969c-4577-85f2-1ce132368215/kejedonib.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001a8f1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A8F1 25696 bytes
SHA-256: 03bbf21049a3dcbfdfdc79589f0b5d71e73fbb37ba3cd4540a4b437713a2336b
font_00_sfnt_off00015022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15022 6472 bytes
SHA-256: 4c2751fa13afd5223bb944824fcce69b250c10088d4ff22d423784d94d7ed3bb
font_01_sfnt_off00016044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16044 5224 bytes
SHA-256: 260a7ef2da1e6d89f4d416093ecb64829eedd6137a8088119def4313bede246a
font_02_sfnt_off000171f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171F0 5304 bytes
SHA-256: b681c573e7f4ed43e141638ea954e258f6a97e9f1948ad9a38128464750d1c62
font_03_sfnt_off000181b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181B3 11492 bytes
SHA-256: 6677ba3db62f584046f52e13f2e211087c9f986fd46ac0db093fe103f10b425b
font_05_sfnt_off0001d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D67E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176