Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4fd77ba07ef9622…

MALICIOUS

PDF

73.5 KB Created: 2021-03-29 13:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 741fa4f84976240e6231ab494226540b SHA-1: c6ad533351e9421d10ed912dc606100264d1af3f SHA-256: e4fd77ba07ef962229d23c6193de1b0c3f91f070a54dc80ada5cf2eee2fd0789
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the structure suggests an attempt to lure users to external sites, possibly for further exploitation or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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/strik?utm_term=how+much+is+sketchup+pro+2020 PDF link annotation
    • https://xoxuluxikodo.weebly.com/uploads/1/3/0/8/130814296/sakowilotolev.pdfIn PDF document text
    • http://gvidilon.ru/adblock_plus_pour_chrome_android009a0.pdfIn PDF document text
    • http://lowwsaw.xyz/how_to_edit_a_logo_in_canva8c2vw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493891/normal_603ea74d19323.pdfIn PDF document text
    • http://gukovukub.22web.org/the_annotated_transformer.pdfIn PDF document text
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/dogov.pdfIn PDF document text
    • https://zunepijubu.weebly.com/uploads/1/3/3/9/133986973/bidol-lamufizojomugi.pdfIn PDF document text
    • http://lifobamalelit.22web.org/81007864028.pdfIn PDF document text
    • http://polikarmonolit.ru/8557249838vbwb5.pdfIn PDF document text
    • https://dovoviwum.weebly.com/uploads/1/3/0/7/130776035/vevukur-mapaw-dagem-lurepu.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/ePCjjja/superhero_fruit_2_premium_robot_fighting_mod_apk.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/mario_kart_r_romy1gah.pdfIn PDF document text
    • https://zelekunidos.weebly.com/uploads/1/3/2/6/132682808/gexitigaw_mojegi.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/jibum.pdfIn PDF document text
    • https://sopogokatoluj.weebly.com/uploads/1/3/1/0/131071191/9400027.pdfIn PDF document text
    • https://cdn.sqhk.co/zeboxuze/lwA8hdU/super_hero_tycoon_2_player_codes.pdfIn PDF document text
    • https://zajoralesame.weebly.com/uploads/1/3/0/9/130969459/sibagipisisadid-wesisidut-biwurejovenosaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384831/normal_6055ad96e82df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rodobokojezaga.epizy.com/23766315489.pdfIn PDF document text
    • http://pusovogubazix.epizy.com/arousal_theory.pdfIn PDF document text
    • http://febarufowit.epizy.com/40216433193.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_off0000e18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18B 5324 bytes
SHA-256: b4202c321ffc074ec8ed1dfe2e0f3190d3999faafd11c962a63c5ed71be76858
font_01_sfnt_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 10836 bytes
SHA-256: e5ba127f4a5dd84d992ea2c5926fc8156582e4fb35463502fe7e654b939aeea5

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