Malicious PDF — malware analysis report

Static analysis result for SHA-256 014a1dadbb287ac7…

MALICIOUS

PDF

95.4 KB Created: 2021-03-01 22:32:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 9167b8cb0e1614ab61f3e067c2b79a4b SHA-1: 9320fd5f5de5feb0c1fbab7718e490f383d3a0f2 SHA-256: 014a1dadbb287ac7fc529cd36d4fbb805505ae47798d97c5a1b491182745a52f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various PDF files hosted on disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs are likely used to distribute further malware or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=does+minnesota+have+enhanced+driver%2527s+license PDF link annotation
    • https://vebafuxitupum.weebly.com/uploads/1/3/4/8/134890404/2690822.pdfIn PDF document text
    • https://febelozo.weebly.com/uploads/1/3/4/5/134599394/bovoleleboto.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/heAhfjf/kpop_music_town_los_angeles.pdfIn PDF document text
    • https://lelodudovoveju.weebly.com/uploads/1/3/1/6/131607117/8520305.pdfIn PDF document text
    • http://madewithsunshine.com/how_to_short_trade_on_robinhoodfksix.pdfIn PDF document text
    • https://jakigirizog.weebly.com/uploads/1/3/1/4/131453624/digozaw.pdfIn PDF document text
    • https://cdn.sqhk.co/renonidofel/bYjghfB/teddi_mellencamp_baby_condition.pdfIn PDF document text
    • http://getyourscore.info/tonesusuzefitefewapodamiptsv4j.pdfIn PDF document text
    • https://gaturavokig.weebly.com/uploads/1/3/4/3/134317265/fojume-monujo-tegikeranesine-dasotajabeg.pdfIn PDF document text
    • http://jobs-ingenieur.best/jazipoteh5m8o.pdfIn PDF document text
    • http://segwaywheelchair.ru/pride_and_prejudice_by_jane_austen_full_moviebf046.pdfIn PDF document text
    • https://tekuxarutupun.weebly.com/uploads/1/3/0/7/130775258/demawejolov-nasarupatekuva-famosurolurut-zevumapex.pdfIn PDF document text
    • https://pizizidoto.weebly.com/uploads/1/3/0/8/130873839/f1fcfa77df.pdfIn PDF document text
    • http://matcobzor.ru/why_is_the_mediterranean_diet_so_good_for_you5voao.pdfIn PDF document text
    • https://nozusetemakofam.weebly.com/uploads/1/3/1/4/131408546/ligabodadafelape.pdfIn PDF document text
    • https://cdn.sqhk.co/naxenunovus/hiZgjhg/87089703168.pdfIn PDF document text
    • http://leaninrzpd.site/gizezeveduludyojfm.pdfIn PDF document text
    • http://neo-tp.ru/situational_dialogues_exampleslmux8.pdfIn PDF document text
    • http://d-youtube.com/the_reluctant_fundamentalist_erica_character_analysis0c860.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://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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 6440 bytes
SHA-256: 705377623a4c4344e02470fedf876d1ed6f0c7c0eac322cafb15afc9430d14bf
font_01_sfnt_off00011707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11707 5060 bytes
SHA-256: 7dc1180faf813bab97798b3d5c5e90c1bc610366eec6f04fc7db38952d4c9ce6
font_02_sfnt_off0001280f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280F 10476 bytes
SHA-256: 87831ca50fca66261c1b045ba81c2cbe30fdf44c950fadc9e76e5e715d39139c
font_03_sfnt_off00014c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C23 16036 bytes
SHA-256: bc1c1644e30597ae0beaac312b9749a82b64e26c109397326cdc67fdbaf2fe17
font_04_sfnt_off0001608a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1608A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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