Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3e680281338ef1…

MALICIOUS

PDF

75.8 KB Created: 2021-03-29 07:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3781e65835585c9ac242c2f6f02eb576 SHA-1: 2e125a5132f93efa9b49c82056463d797ebfb345 SHA-256: 4c3e680281338ef134792ff64509bc44ce9a3e13570df076a1ea868833bbe452
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search results or redirect users to potentially harmful content. The ClamAV detection and ML classifier further confirm its malicious nature, classifying it as a phishing trojan. While no scripts were directly extracted, the presence of numerous external links indicates a likely attempt to download or redirect to malicious payloads.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=vw+golf+service+manual+pdf
    • https://ruvawigalovenu.weebly.com/uploads/1/3/4/3/134318686/mokasetumu.pdf
    • https://xigokujote.weebly.com/uploads/1/3/4/6/134649591/xozav.pdf
    • https://sunajekivogemaz.weebly.com/uploads/1/3/4/8/134895881/3480126.pdf
    • https://tunuwadubozowe.weebly.com/uploads/1/3/4/3/134363043/pedivufopeg-bakediwexexasov.pdf
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/3332830.pdf
    • https://wajevubal.weebly.com/uploads/1/3/4/6/134687537/linow.pdf
    • https://roserilufelojow.weebly.com/uploads/1/3/1/8/131856860/33f5272a.pdf
    • https://miwuzuxatidako.weebly.com/uploads/1/3/0/7/130775980/nawot.pdf
    • https://vapasunodisina.weebly.com/uploads/1/3/0/8/130873802/6811e6009b2.pdf
    • https://zunepijubu.weebly.com/uploads/1/3/3/9/133986973/kikinakiduligis_fogafunijase_fofegopoxaxi.pdf
    • https://wimowago.weebly.com/uploads/1/3/0/7/130775393/e5e8025.pdf
    • http://gidujoluj.mypressonline.com/xejelabemowuxenukizebab.pdf
    • https://fedobakeruja.weebly.com/uploads/1/3/4/3/134367732/geduwubu_rijavataxugopa_bejete.pdf
    • https://rutikaxa.weebly.com/uploads/1/3/0/7/130738846/3672119.pdf
    • http://dizurexemubegog.mygamesonline.org/how_to_buy_stocks_for_beginners_in_india.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c53bbb9e-cb7c-404e-bd59-b3d9fd037feb/what_did_no_game_no_life_copy.pdf
    • http://fugufaza.myartsonline.com/algorithms_sedgewick_wayne.pdf
    • https://uploads.strikinglycdn.com/files/c79a2c4c-71c5-48ef-841c-80b55655a160/draco_malfoy_half_blood_prince_gif.pdf
    • https://uploads.strikinglycdn.com/files/67d002dc-7db4-4991-9d0d-4ef262ec34df/tri_tronics_sport_basic_g3_charging_cradle.pdf
    • http://zipemoluligera.myartsonline.com/xalajuz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92f.bin
5b87d96b9f882a6b3e63aba5f79c15d23eaec4c9ce471910b469ef1e33d79cd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 5592 bytes
font_01_sfnt_off0000fc43.bin
039cf90975b37dcff31cfb9287696badc264092bda4d738713a21a3ca09b6971		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 11112 bytes

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