Malicious PDF — malware analysis report

Static analysis result for SHA-256 8372ac5b00c77733…

MALICIOUS

PDF

81.3 KB Created: 2020-11-24 04:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8239cfa3244140de44aade4b95daf31e SHA-1: 00f95cb0544dc6758579bb12143d2b943340668f SHA-256: 8372ac5b00c7773316a3cbea3287b52f57e90bb3c6e1fd1fcdc425720912f0da
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to manipulate search engine results. The primary URL, https://traffking.ru/strik, is likely a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffking.ru/strik?utm_term=septuaginta+interlinear+grego+portugues+pdf PDF link annotation
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/838015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385847/normal_5f92d2a47a29b.pdfIn PDF document text
    • https://rifonaro.weebly.com/uploads/1/3/4/6/134679964/a857638d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458417/normal_5fb31c42688e4.pdfIn PDF document text
    • https://pimupaxepa.weebly.com/uploads/1/3/1/8/131857198/zinuwu_wirepe_fodagid_ruxovajaz.pdfIn PDF document text
    • https://jekowidemovo.weebly.com/uploads/1/3/4/7/134702183/fatosomifos_foguxelef_nenanuwepozu_libigo.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/nebajetuboji-wesifatenakub.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vokeri/lovekaxukimugede.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/aion_crafting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kepevipawit/card_games_21_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/automate_the_boring_stuff.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/524351ba-5722-4649-9026-2c1ec9cbf6fb/i_survived_tv_show.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e1ffcfc-13de-4054-b55d-2f14eacfe1ab/past_tense_spanish_verbs_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/52741815460.pdfIn PDF document text
    • https://s3.amazonaws.com/suzeduselu/sovesokevedi.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000d81d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD81D 15760 bytes
SHA-256: 0487fb0af49b207e973ab8e2614125ddea7cd3b7cbccdc0f86df09bca492b12e
font_00_sfnt_off0000c607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC607 5312 bytes
SHA-256: 40172adce97b920ca52ec97e0b291eae722d6db09efab8f31f0e20d7968fa48f
font_02_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 16628 bytes
SHA-256: 1908c99736cb72c786583827352572d09dca0ffd4235b5597d898d2b6f4bad4f

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