Malicious PDF — malware analysis report

Static analysis result for SHA-256 efef46c3059c5283…

MALICIOUS

PDF

83.0 KB Created: 2021-03-17 11:45:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b025a3691009fbd54b583bedbdca1260 SHA-1: 77161dd58f777c676b0f15bc157225085cdbfa0d SHA-256: efef46c3059c5283acc6ef2066664747c2dfb03e778b8d7beb54111f7221cc03
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://druttle.ru/strik?utm_term=diabetes+cookbook+for+dummies+pdf PDF link annotation
    • https://cdn.sqhk.co/maxabamed/f2MQggW/video_calling_device_for_elderly_australia.pdfIn PDF document text
    • https://kolerekum.weebly.com/uploads/1/3/4/3/134350376/fegevugig.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/f9uImXI/50614158624.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/dqigjcY/89290138817.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/2008_jeep_wrangler_sahara_unlimited_specs.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/9pLX0H2/sofia_the_first_flying_horse_name.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468836/normal_5ff29fe0a421e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470689/normal_6027c4024db0b.pdfIn PDF document text
    • http://trenketo.buzz/46444678701cxce7.pdfIn PDF document text
    • http://italia-doc.space/juvikefozm9mnd.pdfIn PDF document text
    • http://busurman.space/jejolululozifopolemuridz59y.pdfIn PDF document text
    • http://idealica-italiaoficial.site/the_elephant_in_the_village_of_the_blind9cloy.pdfIn PDF document text
    • https://bavanakeburosot.weebly.com/uploads/1/3/5/3/135302165/fozosune.pdfIn PDF document text
    • https://kewidanuratug.weebly.com/uploads/1/3/5/3/135323433/5464406.pdfIn PDF document text
    • https://cdn.sqhk.co/gatutojuse/jcZijhb/banana_boat_sport_performance_ingredients.pdfIn PDF document text
    • https://piwebodowumogoj.weebly.com/uploads/1/3/4/8/134857209/8586009.pdfIn PDF document text
    • http://clubstore.pro/lg_xboom_ck43_300w_hi-_fi_stereoefqjt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fada511a-f15f-4403-aff3-a06cbbb448ff/hunter_x-core_sprinkler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97dbe42e-ca87-4acb-b6df-68d60d197777/gigavesum.pdfIn PDF document text
    • http://zusaxadixuxot.myartsonline.com/biology_project.pdfIn PDF document text
    • http://naxesabefadufu.atwebpages.com/72838164131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f6ba134-bba7-4ac0-abe5-12d0e87699fa/66878186689.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_off00010585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10585 5472 bytes
SHA-256: 38d371fbb8b547b7115a008db010241aa8a2787392d892242932fbb2bd0a5ead
font_01_sfnt_off0001180d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180D 11208 bytes
SHA-256: cea3534ac8ed4d435dd51a3cb52cead9ace0e2554286f802bf1eedbf5c8379dc