Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a61abe9a40619fe…

MALICIOUS

PDF

90.1 KB Created: 2021-03-29 19:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 022dc023eeee7b3afa3312ca4ff05c78 SHA-1: 1df126c195368aa3f72d567bc87b7b016111ce52 SHA-256: 8a61abe9a40619fe609691fed0eb1ad9eba7d5551d5fe9b2ad3f97cb70b07de0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://midufefew.ru/wix?keyword=solving+systems+of+equations+by+substitution+worksheet+steps PDF link annotation
    • http://santand-es.com/29_states_and_capitals_of_india_downloadmk1tb.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/ijHCbhb/lojuwuwupijax.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/hgjihie/x_core_sprinkler_system_no_power.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/0f7e3409e6708d.pdfIn PDF document text
    • http://qunit.space/borrowers_slip_form_definitionwzylw.pdfIn PDF document text
    • https://nafepamozox.weebly.com/uploads/1/3/1/0/131070284/7b9de793e1c.pdfIn PDF document text
    • http://winoorama.fun/exion_hill_racing_mod_apk_unlimited_moneyg8ogn.pdfIn PDF document text
    • https://wowaximemufa.weebly.com/uploads/1/3/1/4/131453960/mijaburo_mojiraberuxu_rilubikixupi.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/jg7Qhb3/hachiko_movie_dog_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/tomibigi/eigjdjg/lock_screen_cute_wallpaper_iphone.pdfIn PDF document text
    • https://wazolupagod.weebly.com/uploads/1/3/0/7/130775763/benaketiwelupifaze.pdfIn PDF document text
    • https://binaxigaxixin.weebly.com/uploads/1/3/4/8/134864800/a87a438c30.pdfIn PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/vusitakowuratodumuv.pdfIn PDF document text
    • https://cdn.sqhk.co/givujelised/ijidWjd/17460864093.pdfIn PDF document text
    • http://nadahul.ru/who_is_the_other_male_dancer_in_white_christmasdtcc7.pdfIn PDF document text
    • http://meetsalon.xyz/siwejunagezfrvjf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/93992345193.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/gurivorokidajotulekoximo.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/rich_brothers_garden_design_instagram.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_f6b9ba51a5e748f195a8e67bd5b00688.pdf?index=trueIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_c9cd1280620747d4957e742d58aa2bd8.pdf?index=trueIn PDF document text
    • https://c0a42e0f-4cce-4e1b-84a6-2a5440198d67.filesusr.com/ugd/440b6d_b1381b37b78e485283f5f0e6f358f08f.pdf?index=trueIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_be209be2878546cbaedecfa73dde00c1.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 3664 bytes
SHA-256: a93b7fe94f31fbf2b86d4464c3626617385f27df6142c96152979f861afd324e
font_01_sfnt_off00010b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7F 6000 bytes
SHA-256: 2121843480269922cd861a183caf1a06f55ac558edade989fa5463d7544249d4
font_02_sfnt_off00011fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDA 10640 bytes
SHA-256: 52f63fb5e488f2bdbf1b5f783ce0bc146d85c66cd43438d527ccfbf4b312af54
font_03_sfnt_off0001448f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448F 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61

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