Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ee7c396e8d0b34…

MALICIOUS

PDF

100.3 KB Created: 2021-03-07 12:45:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 149ea3055efd854a4edc78db2af8b194 SHA-1: 245733d742fafd4fbb022a7ca1e277b6af2e8678 SHA-256: 79ee7c396e8d0b340eefa315590c6126f661fe31fb4b56e15352c56d7954ddf5
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains a large number of external URIs, many hosted on disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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/strik?utm_term=is+strawberry+flavoured+milk+healthy PDF link annotation
    • https://cdn.sqhk.co/pabopimi/jcvjaMJ/dragon_ball_z_online_game.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/653b79b3.pdfIn PDF document text
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/483907.pdfIn PDF document text
    • http://options.expert/vogesubeniluracckke.pdfIn PDF document text
    • https://cdn.sqhk.co/jaziwuke/gcijRif/22126456710.pdfIn PDF document text
    • http://sdfafq.info/naruto_shippuden_episode_guide_no_fillers5ceo7.pdfIn PDF document text
    • https://solugelefeko.weebly.com/uploads/1/3/0/7/130740562/valapof_bezijox.pdfIn PDF document text
    • https://ledosixekesi.weebly.com/uploads/1/3/4/3/134313849/b067e68b.pdfIn PDF document text
    • https://divewamekavese.weebly.com/uploads/1/3/1/8/131860060/4928729.pdfIn PDF document text
    • http://leledup.mypressonline.com/is_magic_bullet_as_good_as_nutribullet.pdfIn PDF document text
    • http://winfreeiphone.xyz/85539216205eivcz.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/u1ieRdc/qr_code_scanner_for_pc_free_download.pdfIn PDF document text
    • https://fudukonuxevefez.weebly.com/uploads/1/3/4/6/134606022/jazomegubisanijoka.pdfIn PDF document text
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/sowoburasuvatire.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/ibda5jd/sprouted_pixel_dungeon_chalice_of_blood.pdfIn PDF document text
    • https://livadasim.weebly.com/uploads/1/3/4/3/134312527/7915473.pdfIn PDF document text
    • http://national-verifyteam.com/turerukirumezedegud5pi8f.pdfIn PDF document text
    • https://tupusedaluniji.weebly.com/uploads/1/3/0/7/130738871/b08bb53b9bc281.pdfIn PDF document text
    • https://cdn.sqhk.co/vobilurerire/jjGFhf3/bug_s_life_cast_with_pictures.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/tecumseh_tc300_carburetor_diagram.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/a9d64f6b-5d7e-49c2-aa96-84a14bbcae58/21457647235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c912c192-9dd8-4e0b-832b-209a459d34e6/vuvasixinugiboboxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/653bad20-d854-44e8-ad64-6f3780e0f376/digital_design_and_computer_architecture_solutions.pdfIn PDF document text
    • http://ditanumugagoma.myartsonline.com/loboju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d02b3e7-3dff-4a2e-b78a-24519fa811d7/digitech_rp_255_manuale_italiano.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_off00013cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF2 3300 bytes
SHA-256: 47d9e034c5cca91f7910e526a2893662f08b5f7503035e2462e11981a763831c
font_01_sfnt_off0001489c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489C 5540 bytes
SHA-256: 81c74b7dad502817d2d1b957729d4c5f03c65c107f37f2d4a26a6fc2fe219672
font_02_sfnt_off00015b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B65 11604 bytes
SHA-256: c3bfd11b5c6c8e0ac16bd9d1e62f422aa1aeef134da791aca361122311ae04b9