Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3c1fca62cdde67…

MALICIOUS

PDF

99.8 KB Created: 2021-03-06 14:02:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 169fa10f48ac49ca760da15f84042922 SHA-1: 8962b4073e55037d394a3f4762faa04e7ff2cf89 SHA-256: ca3c1fca62cdde679b1d3ec2a210ed775455206cf44359b1756de384f4add11d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spamming operation. 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 URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://lozipotod.ru/aws?utm_term=how+to+get+onyx+osrs PDF link annotation
    • http://busforpay.online/how_to_exercise_the_gluteus_maximus_musclefq6vb.pdfIn PDF document text
    • http://stepka2016.xyz/citizen_navihawk_wr_100_manual1ba9g.pdfIn PDF document text
    • http://lngcliente.com/dota_2_mid_guide_20191lp2f.pdfIn PDF document text
    • http://bestrongbyg.com/seat_ibiza_fuse_box_layout_20144lnrs.pdfIn PDF document text
    • http://mogoxopedutisaw.iblogger.org/easter_addition_and_subtraction_worksheets_for_kindergarten.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/square_one_blackpink_albumewdr4.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/dmQja0x/red_vs_blue_wiki_lopez.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/AhaBkJw/79498793631.pdfIn PDF document text
    • http://gtomishebs.xyz/how_to_board_a_ship_in_the_pirate_caribbean_huntvee9n.pdfIn PDF document text
    • http://vkrowl.com/times_table_worksheet_grade_2slz20.pdfIn PDF document text
    • http://binixoloxagaj.iblogger.org/48769522852.pdfIn PDF document text
    • https://cdn.sqhk.co/gozolijitow/F2jgLgh/music_lines_labeled.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_1eae0b7afcee47d5b5011abb180ed12c.pdf?index=trueIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_354857707a3147fa826905e0aadecfc7.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_9bdabd9277ff400384b74522c8c883b2.pdf?index=trueIn PDF document text
    • http://zebivavube.epizy.com/nowigedal.pdfIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_308e7ac093934adc8cbfc3355ed0fe72.pdf?index=trueIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_0765acd4b5854a1bbd18db298bf4e9d1.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_32feeb1cff3c4ed9a226a3b7cf03f1aa.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_fa9c85aad7b742d5a344ba0e0d89a08e.pdf?index=trueIn PDF document text
    • http://bitivapudubidi.epizy.com/civilwarland_in_bad_decline_satire.pdfIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_86cfa7395f544baba7fee6ab46fa5e8e.pdf?index=trueIn PDF document text
    • http://fogomagof.epizy.com/cassia_fistula_medicinal_uses.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_c7745f660055424f8e04ed8306ffcd30.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_5086f4e66687427c84d55451b4010c0d.pdf?index=trueIn 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_off0001493a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493A 4836 bytes
SHA-256: 3bef804b7aa387d970236ff76b618a6b1d80a1571feba2553da3529fb94cf955
font_01_sfnt_off000159db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159DB 11616 bytes
SHA-256: ed5e50ae9d7f95c05f04835b33c0b1f1e2df0390df9c02c9c4d36bbd8cedf32f