Malicious PDF — malware analysis report

Static analysis result for SHA-256 d556a35146ee693b…

MALICIOUS

PDF

74.2 KB Created: 2021-01-03 03:12:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 348f7edd851c173713820d47dc07f95c SHA-1: 85df32d7dddd4e253515c7e4325cb228ddca4b27 SHA-256: d556a35146ee693b80e6fc4612e19b9232c36cedced9c181aa9b76a6871ddb38
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector and a link farm. The document body, though heavily obfuscated, suggests a lure related to 'Vedic astrology stock market analysis'. The primary attack vector appears to be directing users to a network of malicious and SEO-spam URLs, likely for phishing or malware distribution.

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
  • 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.
  • 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://cctraff.ru/aws?utm_term=vedic+astrology+stock+market+analysis+pdf In PDF document text
    • https://cdn.sqhk.co/zurefaxenov/2hfXaQb/1569516482.pdfIn PDF document text
    • https://besajovepew.weebly.com/uploads/1/3/4/6/134633036/bd3003282c2fb8b.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/jikWVgd/neo_bomberman_classic_arcade_juego.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/gfhcge9/switch_sandisk_ultra_200gb.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/efc6a3.pdfIn PDF document text
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/fikojavowofena_nonutipigak.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/icrijIX/samsung_weather_app_symbols_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/vejanozugova/ajfxibj/21489012380.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/0d61353f-4eea-4281-9541-9ce03da1f6b8/public_sector_programs_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808f7263-985b-4cce-87d8-ed6727f3e0c2/kaxojupixupilir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aec94c66-1346-498a-bc0d-5612f889ae89/51841093420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d8a7e38-4f06-4b5b-9668-e63c8507e723/jenn_air_grill_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/astro_boy_the_video_game_ps2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfea8547-2fae-4457-854e-0d2d6938b431/39287147951.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_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 5608 bytes
SHA-256: da4d52a8eef75dbe60b119052fbd38c8eebcd1de7e1c1654d1587b9eb0bf3c61
font_01_sfnt_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 11788 bytes
SHA-256: 61bd39be6bdd571d402d011b7f2e4128d47df52c3ed985067886f285c7980c81

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