Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd89c08aec30570…

MALICIOUS

PDF

65.6 KB Created: 2021-02-20 21:51:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: b680ce84d021ef39e3436a99f841df71 SHA-1: 5f09ffd296dc41f0c0dd2c54303006846ab58651 SHA-256: 7bd89c08aec305701762ed00425cc66ab3db22b093d7d7bd07b0a77cb13a5e4f
252 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links pointing to external PDF files hosted on various domains, indicating a link farm or SEO manipulation tactic. Several critical heuristics fired, including 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM', strongly suggesting malicious intent. The ClamAV detection further confirms its malicious nature, classifying it as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the document's structure and embedded URLs are indicative of a phishing or malware distribution attempt.

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.
  • 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://crophysi.ru/strik?utm_term=hp+photosmart+c7200+series+manual In PDF document text
    • https://kunexiravirub.weebly.com/uploads/1/3/5/3/135344507/tifoxikan.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/cic6jg8/xemimimojolunamogukazava.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/iniijbj/kpop_groups_list_female.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477626/normal_5fdb8f8fdd807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385010/normal_602f637e36fbe.pdfIn PDF document text
    • https://cdn.sqhk.co/sakupiraf/Vjf6uv4/interstellar_soundtrack_best_song.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/3289274653590.pdfIn PDF document text
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/nilowotibem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502698/normal_5fecc4119d4fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375071/normal_602cd9321a027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475209/normal_600f01806f441.pdfIn PDF document text
    • https://poburazaz.weebly.com/uploads/1/3/5/9/135993358/xutatejalib.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
    • http://bexadujozopu.epizy.com/felalogew.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/setus.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/jovubigezuzukuvunubi.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/nds_emulator_for_android_6_apk.pdfIn PDF document text
    • http://renawexit.epizy.com/tiligodedulizu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB656 5372 bytes
SHA-256: c557b042bcc5d71dd1f37bda59dbb76c5b9af0def1839994b621597331412760
font_01_sfnt_off0000c86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86C 10148 bytes
SHA-256: b248ed7b31dd2e364cac6f712b5bc030554ca9d82e2a0c3b60e41d787adabe25
font_02_sfnt_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3