Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a86cda4fc81e401…

MALICIOUS

PDF

93.1 KB Created: 2021-01-31 02:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8d8860ca4d6c0357c991250ade07e2aa SHA-1: 76eef8d40e8b27203866edddd63327ac8c48c5d2 SHA-256: 7a86cda4fc81e40163773c3a7ca0e8ab39533e08f9967707d5b3a864a5c6e3ab
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to distribute traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a link to a known malicious redirector further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/123?utm_term=stevens+model+67+series+e+manual In PDF document text
    • https://cdn.sqhk.co/rurokusulos/1ggcvVe/20840192701.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/jcjgc7d/ridesajamu.pdfIn PDF document text
    • https://fifimijo.weebly.com/uploads/1/3/4/7/134748793/kubivozoro.pdfIn PDF document text
    • https://sujezebaxoxil.weebly.com/uploads/1/3/4/3/134316131/tomexomuzekuvak_wuxokofud_xabedemaz.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/aggRibX/rowefikogegesixanar.pdfIn PDF document text
    • https://budigalaxob.weebly.com/uploads/1/3/5/3/135313384/lunadepozigu.pdfIn PDF document text
    • https://jusodizepo.weebly.com/uploads/1/3/1/0/131070216/0e835.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/jEha1X3/roluxaronizegaresuk.pdfIn PDF document text
    • http://sozetil.66ghz.com/xirutuxezajebeliwina.pdfIn PDF document text
    • https://nobazivikiva.weebly.com/uploads/1/3/0/7/130776215/8097948.pdfIn PDF document text
    • https://cdn.sqhk.co/lesebonun/eigkjda/draw_lines_in_gimp.pdfIn PDF document text
    • https://cdn.sqhk.co/sazobenapur/iejhCie/wallpaper_change_lock_screen_app.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/hp1aSgg/pazogudulujotegob.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://burijudipo.epizy.com/nupixupebinabu.pdfIn PDF document text
    • http://zelixedamaxux.rf.gd/ye_lili_lyrics_song.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_off00012139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12139 5252 bytes
SHA-256: c5c9724cd419e041d43395bbb50619b890080aacef055a2da14ddb52adf1aa43
font_01_sfnt_off000132f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F7 11112 bytes
SHA-256: d406138f6af14556c062e74b2ecf1f062506fd696e97bc8ee5f6a298012ff3fd
font_02_sfnt_off00015909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15909 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

Open this report in the interactive analyzer, or submit your own file for analysis.